How to use svd in cellfun?

Hello,

I'd like to use svd in cellfun. Imagine a multidimensional cell like this:

inst = cell(1, 3, 5, 2);

inst(:,:,1,1) = 
    [308x21 double]    [308x21 double]    [308x21 double]

Each element of inst is a 308*21 double. Now I'd like to apply SVD on each element of inst to extract the singular values, so I write this:

instsvd = cellfun(svd, inst, 'UniformOutput', false);

MATLAB gives me error:

Error using svd
Not enough input arguments.

Any idea how to solve this?

Many thanks!

Answer 1

[Adam]

instsvd = cellfun(@(x) svd(x), inst, 'UniformOutput', false);

The first argument to cellfun should be a function handle, you are passing the name of a function instead, with no arguments. The above should work and is using an anonymous function where 'x' is a placeholder for each of the elements of your cell array in turn.

[Steven Lord]

FYI for this case you could simplify the code just a little bit by using a regular function handle to svd rather than creating an anonymous function.

instsvd = cellfun(@svd, inst, 'UniformOutput', false);

[Xh Du]

Wow, thanks!

[Adam]

Ah, yes, I keep forgetting that, I'm so used to just wrapping things in anonymous functions!