Matlab - running a function with parameters for every element of an array?

Question

Matlab has a nice property that scalar functions (such as sin) can work on arrays, operating on any element of the array and returning an array as result.

I have a scalar function f(x,p) where x is a scalar, and p is a parameter (actually an array of parameters). Given a fixed parameter p, I wish to run f(x,p) on an array A. In a language like Ruby it would look like this:

A.collect{|x| f(x,p)}

But I have no idea how to do it in Matlab for functions that accept parameters and not only the scalar from the array I want to operate on.

possible duplicate of Map function in MATLAB?

Amro
– Amro

2011-06-27 15:30:50 +00:00
Commented Jun 27, 2011 at 15:30 — Amro
– Amro, Commented Jun 27, 2011 at 15:30

Edric · Accepted Answer · 2011-06-27 13:17:18Z

7

The MATLAB equivalent is to supply a function handle taking only a single argument, and sending it to arrayfun.

arrayfun( @(x) f(x, p), A )

For example,

A = 1:10;
p = 2;
arrayfun( @(x) x.^p, A )

Note that the anonymous function creates a closure, capturing the value of p.

edited Jun 27, 2011 at 13:17

answered Jun 27, 2011 at 13:00

Edric

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