How can I differentiate a spline using a finite difference scheme?

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The discussion centers around the challenge of differentiating a spline created from four data points. The user, Karin, expresses difficulty in using built-in functions like fntlr and fnder for differentiation. A suggestion is made to avoid relying on these functions and instead utilize a finite difference scheme for manual differentiation. The conversation highlights the importance of understanding numerical methods for solving such problems, particularly when built-in tools are not effective.
karmko
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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
 
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karmko said:
I can't get it to work; I have tried fntlr, fnder ect.
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?
 

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