Using error in splinetool with more complicated functions

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Michelle Ghrist
Michelle Ghrist 2022-11-10
评论： Michelle Ghrist 2022-11-10
In splinetool, I understand that I can see the error in a spline by giving the original function in this way:
>> splinetool
-> Input your own data
  1. Put vector of nodes in first box
  2. Put function in 3rd box, e.g., cos or exp
Q: How can I use a more complicated function, e.g., x*cos(x)? I've tried @(x) x.*cos(x), x*cos(x), etc. in the 3rd box, but I keep getting errors.
If you just give vectors of data points (or call splinetool(x,y)), you get error = 0 b/c MATLAB doesn't know the original function. How can I tell it the function?

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采纳的回答

John D'Errico
John D'Errico 2022-11-10
Looks like the code is a bit buggy.
Save this function m-file on your search path.
function y = myfun(x)
y = x.*cos(x);
Then type the name myfun, into the field where it asks for a function name.

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