What is the problem with the heaviside function?
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fun =
@(p,x)p(1)*heaviside(x-p(2))
Undefined function 'heaviside' for input arguments of type 'double'.
采纳的回答
Star Strider
2015-9-10
Your function works for me. Do you have the Symbolic Math Toolbox?
If you don’t substitute a call to this one for the heaviside call:
hvsd = @(x) [0.5*(x == 0) + (x > 0)];
I tested both, they give equivalent results.
2 个评论
Mr M.
2015-9-10
Star Strider
2015-9-10
编辑：Star Strider
2015-9-10
Yes. The heaviside function is only in the Symbolic Math Toolbox. My function provides the same results, so you can use it instead. I abbreviated its name to ‘hvsd’ be sure it didn’t overshadow heaviside on my computer so I could test both of them. You can obviously name it whatever you want.
更多回答（1 个）
The error means that Matlab cannot find the heaviside function. Try
which heaviside
to locate the function. The heaviside function is part of the Symbolic Math Toolbox. If you do not have this TB, you can write your own heaviside function
function y = heaviside(x)
y = (x > 0) + 0.5*(x == 0);
1 个评论
Dief Gerard
2022-2-10
@Thorsten Thanks for your answer. It helped me debug my code.
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