How can I apply a function to vectors inside a matrix in MATLAB?

Question

Let's say I have a function f(vec) which takes as input a vector (array) of size 3. I have a matrix M of size 100 x 100 x 3. Is there a way I can somehow apply f to every cell of M, outputting a matrix N of size 100 x 100? For example, N(10,20) would equal

f( M(10,20,1), M(10,20,2), M(10,20,3) )

Obviously I could use a for loop, but I feel like this should be vectorizable.

Daniel · Accepted Answer · 2016-02-17 12:43:17Z

Vectorization in this context means rewriting the function in a way that it accepts multiple inputs at once. Assuming that this is not possible, a for loop is the best possibility.

user1543042 · Accepted Answer · 2016-02-16 03:03:49Z

1

The easiest way to do this is arrayfun

arrayfun(@(x,y,z) f(x,y,z), M(10,20,1), M(10,20,2), M(10,20,3) , 'uni', 0)

answered Feb 16, 2016 at 3:03

user1543042

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1 Comment

David Over a year ago

Note that using arrayfun isn't vectorisation, it's basically equivalent to using a for loop.

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