Summing all the Matrices in a Cell Array?

Lets say i have a cell array with 3 7x2 matrices in it:

.

.

How do i sum them up so to get a single 7x2 matrix?

In this exmaple, i only have 3 matrices.

But i may have a cell array with maybe 100+ matrices.

How should i do it?

[Matt J]

You probably should not be in this situation to begin with. Whatever code you're using to create the cell array, should probably be organizing the data as a 7x2xP numeric array instead. Most operations on an MxNxP array will be more efficient than with the MxN slices split across P cells.

An exception to this is when M*N is large and you're trying to avoid the copies that MATLAB makes when you do things like

    a=A(:,:,i)

but the slices would have to be very very large to warrant that.

Answer 1

[Azzi Abdelmalek]

a={rand(7,2)  rand(7,2)  rand(7,2)}  % This is an example
b=sum(cat(3,a{:}),3)