Why does my matlab say "islocalmax not found" when I try to use it?

I am using MATLAB 2017a. If that function is not built in is there an alternative or a place where I can find the code for that function?

Answer 1

[Star Strider]

The islocalmax function first appeared in R2017b.

If you have the Signal Processing Toolbox, use the findpeaks function.

Answer 2

[Image Analyst]

If you have the Image Processing Toolbox, you can use imregionalmax(). It sounds like it should do the same thing. It's been there for many, many releases.