in preparation
  Command INDEX in alphabetical order and in sequential order

 
                       Alphabetical (˜) INDEX  A B C (ungrouped)  (grouped by type)
 
keywords                    type                        alternative
 
#                        Here utility
^ v                      Here utility
;                        Here utility
.                        Here radix point 
*  /  ^                  Here operator
[ ]                      Here utility 
[ ]                      Here here place  (of an indexed collection or indexed variable)
:                        Here herE sequences
->  <-  =                herE utility
+                        herE drawing/computation
---------------------------------------------------------------------------------------------------------------------
. ,                      here radix point 
%/%  %%                  here operator
%*%                      here operator
!=   !                   here ≠  not
==                       here = (relation)
&   |                    here connective
{ }                      here compound expression
\n \t \b                 here separators
$                        here extracts output 
?Math                    here info
<<-                      here utility
3D                       {see persp}
---------------------------------------------------------------------------------------------------------------------
---------------------------------------------------------------------------------------------------------------------
---------------------------------------------------------------------------------------------------------------------
abovex  abovey           Here add writing     {below too}  [suassex,suassey]
ABOVE above              Here add writing
angle                    Here computation                  [angolo]
affine                   herE here computation
areaPol                  herE here computation
AREAT                    herE computation
a/Arrow  a/ArroW         herE drawing         {below too}  [f/Freccia f/FrecciA]
---------------------------------------------------------------------------------------------------------------------
abline                   here grid
a/AboveX/Y               here add writing
abs                      here operator
add                      here operator                     [som]
add                      here drawing
Animation                here here topic
app                      here approx. numeric string
approx  approx2          here computation                  [approssima …2]
ARC  ARCd  arc  arcC     here drawing                      [arco]
areaF areaPar areaPolar  here drawing/computation
a/Arrow2  a/ArroW2       here drawing                      [f/Freccia2 f/FrecciA2]
array                    here here data
as.roman                 here computation
ASP                      here box                          [RAPP]
AXES  AXES2              here drawing
---------------------------------------------------------------------------------------------------------------------
---------------------------------------------------------------------------------------------------------------------
---------------------------------------------------------------------------------------------------------------------
Bar  BarNames            Here drawing         {below too}  [Barre,nomiBarre]
BF                       Here box
boxplot                  Here Here drawing    {below too}
---------------------------------------------------------------------------------------------------------------------
BAR  BarH                herE drawing                      [BARRE, BarreO]
bisector                 {see incentre }
boxPlot Bbox Hbox        herE drawing
---------------------------------------------------------------------------------------------------------------------
BarC  BARC               here drawing                      [BarreC, BARREC]
BAR2                     here drawing                      [BARRE2]
barplot                  here drawing
bases of numeration      here topic
bezier                   here drawing  
Binomial                 here topic
bivariate data           here topic
BOH()                    here 3D
boxAB                    here here drawing
BOX BOXg BOXw            here box                          [BOXs]
Box_ Boxm_ BoxW BoxmW/WW here box                          [BoxmN, BoxN]
BOXW  boxW  boxWW        here box                          [boxmN,boxN,boxNN]
bquote                   here add writing
break                    here loop
---------------------------------------------------------------------------------------------------------------------
---------------------------------------------------------------------------------------------------------------------
---------------------------------------------------------------------------------------------------------------------
c(…)                     Here collection
circle circle3p center3p Here drawing/comput. {below too}  [cerchio,centro3p,cerchio3p]
clock                    Here time
Colors                   Here info {see also rgb} {below too} [Colori]
---------------------------------------------------------------------------------------------------------------------
circle_circle            herE drawing/computation          [cerchio_cerchio]
circle3pA circleA …      herE drawing/computation          [cerchio…]
circleC                  herE drawing                      [cerchioC]
coldash                  herE drawing                      [coltrat]
Coldash                  herE drawing                      [Coltrat]
CROSS CIRCLE ...         herE drawing
CURVES                   herE drawing/animation
---------------------------------------------------------------------------------------------------------------------
casa()                   here 3D
cat  CAT  Cat            here print
circl3p  circl           here drawing                      [cerch3p,cerch]
centreParam centrePolar  here computation
centrePol                here drawing/computation          [centroPol]
cex.axis                 here add writing
choose  combn            here operator
CiRcLe                   here drawing                      [cErChi]
CLEAN                    here drawing                      [CANCELLA,PULISCI]
colors                   here parameter
coloring the figures     {see diseq }
colRect                  here drawing
colrow                   here box
Code Decode              here operator                     [Codifica ,Decodifica]
complex numbers          here here number
confInt                  here computation
Conic                    here drawing/computation
Contingency Tables       here topic
continuity  jump  hole   here topic
contour                  here drawing
cor                      here here computation
cor2                     here computation
crossp                   here operator
cos sin tan acos … atan  here operator
CURVE CURV CUR CURVEN CURN  here drawing  {see also param}    [curva,cur,curvan]
curve fitting            here topic
curve1P ... curve4P      here drawing/animation
---------------------------------------------------------------------------------------------------------------------
---------------------------------------------------------------------------------------------------------------------
---------------------------------------------------------------------------------------------------------------------
distribution             Here computation     {below too}  [distribuzione]
div  divisors            Here computation                  [divisori]
---------------------------------------------------------------------------------------------------------------------
d/Dart dirArrow/w1/w2    herE drawing/comput. {below too}  [frec,dirFreccia/a1/a2]
Directio/on/onx/ony      herE drawing/computation          [Direzione]
divInt                   herE computation
---------------------------------------------------------------------------------------------------------------------
d/Dart2  Direction(…,0)  here drawing                      [freccia2]
data                     {see  readLines   read.table   scan   script }
degrees                  here constant                     [gradi]
deriv/v1/…/v6 D derivxy  here computation                  [derivata,...]
det                      here operator
dev.new  dev.off         here box
Die DieB Die2 DieB2 DIE  here statistics                   [Dado,DadoB,Dado2,DadoB2,DADO]
dif                      here operator
diredif                  here drawing
diseq  diseq1/2          here drawing
distance                 {see point_point  point_line  distPF }
distCC  distPC           here computation
distPF                   here computation
dist_taxi                here computation
dMmM  DMmM               here drawing                      [cMmM,CMmM]
distribution             here topic
dbinom dmultinom         here computation
dnorm rnorm              here computation
dchisq pchisq qchisq     here computation
dpois                    here computation
Dot  Dot2                here drawing                      [Punticino]
dotp                     here operator
---------------------------------------------------------------------------------------------------------------------
---------------------------------------------------------------------------------------------------------------------
---------------------------------------------------------------------------------------------------------------------
e  exp                   here constant/operator
EPS                      here computation
eqSystem                 here computation
escher                   here drawing
eval                     here computation
---------------------------------------------------------------------------------------------------------------------
---------------------------------------------------------------------------------------------------------------------
---------------------------------------------------------------------------------------------------------------------
fraction                 Here operator                     [frazio]
function                 Here Here here definition  {below too}
---------------------------------------------------------------------------------------------------------------------
F_RUN1,…,F_RUN4          {see curve fitting }
factorial  floor         here operator
factorization            {see primes  polyroot }
FALSE                    here constant
file                     {see read...  write }
floor  Floor             here operator
for                      here here loop
fun1P ... fun4P          here drawing/animation
functions (study of)     here topic
functions of 2 var.      here here here topic
---------------------------------------------------------------------------------------------------------------------
---------------------------------------------------------------------------------------------------------------------
---------------------------------------------------------------------------------------------------------------------
GCD                      Here computation                  [MCD]
Gonio … goniom goniome … here herE drawing
graph                    Here drawing  {see also CURVE graphF}    [grafico]
---------------------------------------------------------------------------------------------------------------------
graphF    graphics.off   herE drawing                      [graficoF]
Grid/w GRID/w g/GridH/V  herE grid            {below too}  [Griglia/s,grigliaO/V,…}
gridHC … GridVC gridh/v  herE grid
---------------------------------------------------------------------------------------------------------------------
Gaussian                 here topic
geometric transform.     here here topic  {see also symm}
Gintegral G…ra G…r       here drawing                      [gintegrale,…]
GRAF3D                   {see persp}                         [GRAF3DIM]
graph1/2  graph1F/2F     here drawing                      [grafic,grafi,…}
GRAPH/1/2                here drawing
grid (non-decimal)       here here topic
---------------------------------------------------------------------------------------------------------------------
---------------------------------------------------------------------------------------------------------------------
---------------------------------------------------------------------------------------------------------------------
halfline                 Here drawing         {below too}  [semiretta]
HF                       Here box
Histogram                Here drawing         {below too}  [Istogramma]
histogram                Here drawing  {see also CROSS}    [istogramma]
---------------------------------------------------------------------------------------------------------------------
histoclas                herE drawing  {see also pyramid}  [istoclas]
hms                      herE computation
---------------------------------------------------------------------------------------------------------------------
halfl                    here drawing
help                     here info
hessian                  here computation                  [hessiano]
hist                     here here drawing
hist3D                   here drawing
Hour                     here time
house()                  here 3D
---------------------------------------------------------------------------------------------------------------------
---------------------------------------------------------------------------------------------------------------------
---------------------------------------------------------------------------------------------------------------------
inclination              Here computation
INPUT                    Here drawing
---------------------------------------------------------------------------------------------------------------------
incentre                 herE computation
Italy1/2/3               herE drawing
---------------------------------------------------------------------------------------------------------------------
if  ifelse               here test
inequalities             {see diseq}
Inf                      here constant
integral                 here computation                  [integrale]
integralA,…,integralD    here computation                  [integraleA,…]
INTEGRAL                 here computation
INV                      here operator
---------------------------------------------------------------------------------------------------------------------
---------------------------------------------------------------------------------------------------------------------
---------------------------------------------------------------------------------------------------------------------
LCM                      Here computation                  [MCM]
leng                     Here computation                  [lung]
length                   Here computation
line  line2p             Here drawing {see also polyl} {below too}  [linea,retta2p]
---------------------------------------------------------------------------------------------------------------------
LCROSS   lCROSS   ...    herE drawing
line_line  line_line2    herE drawing/computation   {see also point_inclina}
---------------------------------------------------------------------------------------------------------------------
l2p                      here drawing
last                     here computation                  [ultimo]
lengFun/Par/Par3/Polar   here computation
LIne  Line               here drawing
LR  LR0                  here computation
lty                      here drawing/grid
---------------------------------------------------------------------------------------------------------------------
---------------------------------------------------------------------------------------------------------------------
---------------------------------------------------------------------------------------------------------------------
max  min                 Here operator
mean   Median  median    Here operator   {see also Wmean …}
mid2p                    Here drawing                      [medio2p]
mmpaper1/2/3             Here drawing          {below too}  [cartamm1/2/3]
morestat                 Here Here operator                [altrestat]
---------------------------------------------------------------------------------------------------------------------
maxmin minmax            herE operator
meanPlot medianPlot      herE drawing
---------------------------------------------------------------------------------------------------------------------
MARG                     here box
matrices                 {see array}
MAXF2  MINF2             here operator
mean of a function       here
modulus magnitude        here operator
Minute                   here time
mmpaper   mmPaper        here drawing                      [Cartamm,cartamm]
MNb                      here operator
mosaicplot               here drawing
more                     here operator   {see also add}
multiply multrarot …     here drawing                      [moltiplica,moltrarot;…]
MulTraRot                here computation                  [MolTraRot]
---------------------------------------------------------------------------------------------------------------------
---------------------------------------------------------------------------------------------------------------------
---------------------------------------------------------------------------------------------------------------------
noClass                  Here drawing
now                      Here time
---------------------------------------------------------------------------------------------------------------------
noGrid                   herE drawing                      [noGriglia]
noMean                   herE herE herE drawing
noPrint                  herE option                       [noStampa]
NPF  NpF  NpsF           herE drawing                      [NPuntiF,NpuntiF,NPUNTIF]
---------------------------------------------------------------------------------------------------------------------
nchar  NUMBER            here operator
nclass                   here parameter
Ncolor                   here info                         [Ncolori]
NULL                     here (undefined) constant
NW                       here box
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OUTPUT                   Here drawing
out  (outliers)          herE operator
---------------------------------------------------------------------------------------------------------------------
---------------------------------------------------------------------------------------------------------------------
---------------------------------------------------------------------------------------------------------------------
perp2p                   Here drawing                      [asse2p]
perp3p                   Here drawing
Pie  PieNames            Here drawing         {below too}  [torta,nomiTorta]
Pie(0)                   Here drawing
PLANE                    Here box        {see also ASP  recordP.} {below too}  [PIANO,…]
Plane                    Here box                                    [Piano]
Point POINT              Here drawing    {see also xy  Dot} {below too}  [PUNTO,…]
point_point              Here computation
polyC polyline           Here Here drawing    {below too}  [spezzaC,spezzata]
primes  Primes           Here computation
---------------------------------------------------------------------------------------------------------------------
P_tan                    herE operator
percentile Percentile    herE operator
PIE  PIEh                herE drawing                      [Torta,Tortam]
PlaneW/w/ww PLANEW/…     herE box        {see also boxW}   [PianoS,…]
point_inclina            herE drawing
point_line/2             herE computation
polylineR polyR polyRC   herE drawing                      [poligono,poligo/C]
pyramid                  herE drawing
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P PPP                    here drawing
p2p  polylin/li/l        here drawing                      [a2p,spezzata,…]
Parabola ParabolaM       here drawing
param/mb polar/rb para … here drawing
paste0                   here operator
persp                    here here drawing (3D)
PIEC/_/H/2 PieC/…        here drawing                      [TortaC,tortaC,…]
PLANE2 Plane2            here box                          [PIANO2,Piano2]
PLANEP PlaneP            here box       {see also BOX …}
plot                     here drawing
pointO/D/V               here drawing                      [puntiO/D/V]
pointDiff/0/2            here drawing/computation
polar                    {see param}    {see also pointO …}
polar1P ... polar3P      here drawing/animation
polfun                   here computation
polyD  PQ  P/p/PQtext/2  here draw/add writing             [spezzaT]
polyli                   here drawing (dashed line)        [spezzat]
polyroot  (polynomial)   here computation    {see also solpol  xy_2 …}
polyS polyS2             here drawing                      [spezzaL,spezza2L}
print                    here print
pro                      here operator
probability              here topic
prod                     here computation
prodp  prodp2 … propd8   here computation
prods  prodv             here operator
Ptext PtexT ...          here draw/add writing             [spezzaT]
PXY   (3D -> 2D)         here computation
---------------------------------------------------------------------------------------------------------------------
---------------------------------------------------------------------------------------------------------------------
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quit                     Here closure of the session
Quadrilateral            here drawing (/animation)
---------------------------------------------------------------------------------------------------------------------
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r/RATIO                  Here drawing
radius3p                 Here drawing/computation          [raggio3p]
round rad2 rad3          Here operator       {see also print}
---------------------------------------------------------------------------------------------------------------------
range                    herE operator
rep                      herE sequences
---------------------------------------------------------------------------------------------------------------------
rad4/6                   here operator
RANGE                    here operator
readLines                here here download
read.table               here here download
recordPlot replayPlot    here box (saving/replaying plot)
rect                     here drawing
recursion                here topic
regression/1/2/3         here computation    {see also LR  pointDiff}
reverse                  here operator
rgb                      here parameter
right=FALSE              here parameter
rm(list=ls())            here reset
rottramul …              here drawing                      [rottramol]
RotTraMul  RotP          here computation                  [RotTraMol]
rowcol                   here box
runif RUNIF RUNIF2 RunIf here here number generator
---------------------------------------------------------------------------------------------------------------------
---------------------------------------------------------------------------------------------------------------------
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segm                     Here drawing       {see also line  Direction}
solution                 Here herE operator   {below too}  [soluz]
sort                     Here operator
sqrt                     Here operator
SQUARES  SQUARESC        Here drawing                      [QUADRETTI]
statistic/s              Here drawing                      [statistiche]
stem                     Here herE drawing/computation
Strip  StripNames        Here drawing                      [Striscia,nomiStriscia]
Strip(0)                 Here drawing
sum                      Here operator
---------------------------------------------------------------------------------------------------------------------
seq                      herE sequences
solut                    herE herE here here computation
symm  symm2              herE computation
---------------------------------------------------------------------------------------------------------------------
sample                   here number generator
scale (non-decimal)      here here topic
scan  script  sep  skip  here download
Sd  SdM  sd  sqm         here here operator
seba(0) seba(1)          here drawing
Sec  Second              here time
set.seed  sample         here number generator
series  (Fourier too)    here topic
sheaf                    here here drawing
sigma                    {see dnorm}
sign signif              here operator
simplex                  here computation
Simulation               here here topic
sin cos tan asin … atan  here operator
sk sk2 …                 here operator
slope                    here drawing (/animation)         [pend]
soledif                  here drawing
solpol                   here computation                  [soluzione]
solution2                here operator                     [soluz2]
source                   here download
spline  splineC          here computation
sqm  standard deviation  {see Sd}
startP                   here drawing
stepline  stepl          here drawing                      [Spezzata]
str                      here here compact display
StripC                   here drawing                      [StrisciaC]
strtoi  substr           here operator
substr                   here operator
summary                  here operator
sump                     here computation
system                   here here here here here topic
---------------------------------------------------------------------------------------------------------------------
---------------------------------------------------------------------------------------------------------------------
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THERMO/2                 herE drawing
Tree  Trees              herE drawing/computation {Ptext too} [Albero,Alberi]
triASA/SAS/SSS/ASS       herE drawing/computation
type                     herE add writing
---------------------------------------------------------------------------------------------------------------------
t                        here computation
table                    here topic
tan sin cos atan asin …  here operator
tangent lines            here topic
taylor                   here drawing/computation
test                     here topic
text                     here add writing    {see also bquote}
textAnalysis             here drawing/computation          [analisiTesto]
TICKx  TICKy             here grid                         [TACCHEx,TACCHEy]
toString                 here operator
transl                   here drawing                      [trasla]
tree                     here computation                  [struttura]
trunc  Trunc             here operator
TRUE                     here constant
---------------------------------------------------------------------------------------------------------------------
---------------------------------------------------------------------------------------------------------------------
---------------------------------------------------------------------------------------------------------------------
UNDER                    Here add writing
underx/y  u/UnderX/Y     here add writing                  [sottoassex,sottoAssex,…]
---------------------------------------------------------------------------------------------------------------------
---------------------------------------------------------------------------------------------------------------------
---------------------------------------------------------------------------------------------------------------------
Var  var                 here here operator
vector                   here here here data
versor                   here operator
---------------------------------------------------------------------------------------------------------------------
---------------------------------------------------------------------------------------------------------------------
---------------------------------------------------------------------------------------------------------------------
wait                     here time                         [attendi]
while                    here loop
windows (saving images)  Here box
Wmean Wmedian WSd WVar   here operator
write                    here print
---------------------------------------------------------------------------------------------------------------------
---------------------------------------------------------------------------------------------------------------------
---------------------------------------------------------------------------------------------------------------------
xrot                     herE computation
xy                       herE drawing/computation
---------------------------------------------------------------------------------------------------------------------
xClick                   here display
xend                     here computation
xTab                     here operator
xy_2 … xy_7 xy_fr        here computation
xyz_tfd  tfd_xyz         here computation
---------------------------------------------------------------------------------------------------------------------
---------------------------------------------------------------------------------------------------------------------
---------------------------------------------------------------------------------------------------------------------
yrot                     herE computation
---------------------------------------------------------------------------------------------------------------------
yClick                   here display
yend                     here computation
yTab                     here operator
---------------------------------------------------------------------------------------------------------------------
---------------------------------------------------------------------------------------------------------------------
---------------------------------------------------------------------------------------------------------------------
ZZZ                      here curve storage

 
                            Sequential INDEX
Introduction        A
        >                         source("http://macosa.dima.unige.it/r.R")
Use as calculator   B - E
        * /                       ;                       .
        round                     sqrt                    rad2
        rad3                      fraction                …e…
        div                       divisors
    Developments    E1 - E2
        Trees                     divInt                  hms
    Here
        abs                       sign                    rad4/6
        %/%                       quotient                remainder
        factorial                 choose                  Inf  .Machine  ?Math
        round  floor              e  exp                  print
        signif                    more                    last
        degrees                   str                     write
        \n \t \b                  cat                     for
Other calculi       F - G
        =                         c(…)                    sort
        [ ]                       min                     max
        length                    sum
    Developments    G1
        ->  <-
    Here
        prod                      reverse                 combn
        approx approx2            EPS
Figures             H - J
        PLANE                     BF HF                   circle
        POINT Point               circle3p                center3p
        radius3p                  Colors                  segm
        halfline                  line2p                  line
        point_point               inclination             angle
        mid2p                     perp2p                  polyline
        leng                      […:…]                   polyC
    Developments    J1 - J6
        areaPol                   xy                      arrow
        dart                      dirArrow                Direction
        line_line                 solut                   point_inclina
        line_line2                noPrint                 circleA
        xrot  yrot                circle3pA               type
        circle_circle             polylineR               polyRC
        triLLL                    triLAL                  triALA
        incentre                  P_tan
    Here
        ASP                       record/replayPlot       dev.off
        ARC  ARCd                 circl circl3p arc       halfl l2p p2p
        polyli                    Ncolor                  rgb
        Quadrilateral             P                       PPP
        NW                        polyS polyS2            text
        dart2 arrow2 D… A…        bquote                  Direction
        MulTraRot                 RotTraMul               xend yend  Dot
Graphs              K
        Plane                     abovex                  abovey
        function                  graph                   solution
    Developments    K1 - K3
        graphF                    coldash                 NpF NPF NpsF
        maxmin
    Here
        underx …X                 undery U…Y              aboveY A…
        PlaneP  PLANEP            CURVE cur               graph1F graph1 …2…
        plot                      distPF                  CURVEN
        TICKx …y                  Plane2 PLANE2           solution2
        solpol solut              polyroot                sump prodp prodpN
        if ifelse for while       == != | &     { }       TRUE  break
        xy_2 … xy_7 xy_fr
Statistics          L - N
        Bar                       Pie                     Strip
        ABOVE UNDER above         distribution            min
        max                       length                  stem
        histogram                 noClass                 median
        mean                      Histogram               morestat
    Developments    N1 - N4
        BAR BarH PIE PIEh         rep                     Histogram
        stem/scale                histoclas               pointO/D/V
    Here (also Probability)
        BAR2                      PIEH PieC BARC Pie_ …   boxAB
        hist                      dev.new                 abline
        nclass                    cex.axis                right=FALSE
        runif                     sample                  set.seed
        Var Sd SdM                Die DieB                textAnalysis
More                O - P
        clock                     GCD                     primes
        LCM                       Pie(0)                  gonio(0)
        GONIO(0)                  Strip(0)                mmpaper1/2/3
        SQUARES                   INPUT                   OUTPUT
        r/RATIO
    Developments    P1 - P4
        seq  :                    PLANE/W/w/ww            Plane/W/w/ww
        circleC                   GRID/w Grid/w           gridH/V GridH/V
        Gonio                     CROSS CIRCLE LCROSS COUNT THERMO/2
        affine
    Here
        mmpaper mmPaper           CiRcLe dNmM …

New Sections

S01  Parametric and Polar Equations. Geometric Transformations
       param  polar  distCC distPC  rottramul  multra  multiply … ZZZ; see also #J
S02  Inequalities and Systems of Inequalities
       diseq   diseq2
S03  Vector Calculus
       prodv (or crossp) prods (or dotp) modulus (or magnitude) versor; see also J-2, #J
S04  Lenghts and Areas
       areaF areaPar areaPolar lengFun lengPar lengPolar lengPar3 startP x/y Click
S05  Equation systems
       eqSystem   solut
S06  To estimate the best fit straight line
       pointDiff  pointDiff0  pointDiff2  colRect  rep
S07  Centroid (and Barycenter)
       centrePol  xTab  yTab  Line  LIne
S08  Integrals and Derivatives (and Limits). Taylor polynomial
       deriv,deriv2,…,deriv6  derivxy  integral  Gintegral  eval …
S09  Differential equations (1st and 2nd order). Direction fields
       soledif    diredif
S10  Calculations with "big" numbers. Strings <-> Numbers. Bases ≠ ten
       add pro dif app  strtoi nchar substr toString NUMBER paste0  as.roman MNb
S11  Perspective. 3D
       casa()   GRAF3D   BOH()   seba(0)   seba(1)    PXY  xyz_tfd  tfd_xyz
S12  Regression. Splines. Curve Fitting.
       regression    regression1/2/3     spline  splineC   FRUN…
S13  Bezier curves
       bezier 
S14  Escher
       escher 
S15  Trees and other Graphs
       PQ  Ptext  ptext  PQtext  Ptext2  polyD  CLEAN 
S16  Windows without the margins
       BOXW   boxW
S17  Multiple graphs (in the same window)
       rowcol  colrow    Boxm_  Box_    BoxW  BoxmW    stepline  stepl
S18  Animations
       Hour Minute Second Sec wait  BOXw BOXg CLEAN  fun3P curve4P polar3P  slope
S19  Complex numbers. Matrices. Functions of two variables. Series
       [ see the links ] 
S20  Tree structure (and other graphs)
       tree   (and other commands) 
S21  Random generator of exercises

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