Puoi aprire il codice e modificare la funzione: vedi l'Help
You can open the Code and modify the function: see the Help
HELP

function f(x) { y = y = -0.356759*x*x + 9.09177*x - 39.502166; return y }
...
aX = 0; bX = 25; aY = -30; bY = 30
Dx = 5; Dy = 5
...
Qx= [ 5,  7,  9,  11,  13,  15,  17,  19,  20 ]
Qy= [-1.3,5.4,12.4,15.5,20.9,15.1,14.9,4.9,-2.3 ]
...
AX=BX=AY=BY=""
...
AAX=aX; BBX=bX; AAY=aY; BBY=bY