bsxfun implementation in matrix multiplication

Question

As always trying to learn more from you, I was hoping I could receive some help with the following code.

I need to accomplish the following:

1) I have a vect

Answer 1

Just to add an alternative, you maybe can use cellfun to achieve what you want. Here's an example (slightly modified from yours):

x = randi(2, 5, 3)-1;
a = randi(3,3);
%// bsxfun 3D (As implemented in the accepted solution)
val = bsxfun(@and, a, permute(x', [3 1 2])); %//'
out = reshape(permute(val,[1 3 2]),size(val,1)*size(val,3),[]);
%// cellfun (My solution)
val2 = cellfun(@(z) bsxfun(@and, a, z), num2cell(x, 2), 'UniformOutput', false);
out2 = cell2mat(val2); % or use cat(3, val2{:}) to get a 3D matrix equivalent to val and then permute/reshape like for out
%// compare
disp(nnz(out ~= out2));

Both give the same exact result.

For more infos and tricks using cellfun, see: http://matlabgeeks.com/tips-tutorials/computation-using-cellfun/

And also this: https://stackoverflow.com/a/1746422/1121352