differentiating splines

karmko

Hello
I have made a simple spline(x,y) of 4 datapoints and I want to differentiate it.
I can't get it to work; I have tried fntlr, fnder ect.

Can anyone help?
Karin

LeBrad

Have you tried shouting at it?


What program are you using? Don't bother with built in functions, just use a finite different scheme and find it yourself. Are you familiar with those?