How do I find the local maxima of a vector?

There does not seem to be a function for this.

Answer 1

[Doug Hull]

You can use the following one-line function to determine the indices of the local maxima.

function index = localmax(x)
  index = find( diff( sign( diff([0; x(:); 0]) ) ) < 0 );

[from the MATLAB FAQ of Ancient Times]