algorithm of gradient?

[mapi]

What is the algorithm of gradient?

FX=gradient(F,x);

FX(i)=(F(i+1)-f(i-1))/(x(i+1)-(i-1))??

How about FX(1) and the gradient at the last point?

Thanks,

Mapi

 

[SomptingGuy]

The first and last points are first order only. One is a foreward difference, the other a backward difference. All other points are (as you said) second order.

- Steve

 

[mapi]

Thanks. I check it and it indeed is.

Mapi