Help with multiplication of cell arrays

Hi,

I have an array of 100 1*4 matrices

I have a second array of 1000 1*4 matrices

I want the .* of for each of my 100 matrices multiplied by each of the 1000 matrices.

In total, my ouput should be 100,000 matrics.

I just wanted some help with the code, I think i may be misunderstanding how the arrays are working...

Thanks

Answer 1

[Per]

Hi,

If I understood what you said correctly your problem could be solved like this

A = cell array containing 1000 1*4 matrices B = cell array containing 100 1*4 matrices

C = cell(length(A),length(B));

 for i = 1:1000
    for j = 100
       C{i,j} = A{i}.*B{j};
    end
 end

the for loop could be vectorized to:

    for j = 100
       C{:,j} = A{:}.*B{j};
    end

This will give you an output cell matrix of the size 1000*100

Hope this was of help.

[John]

Thanks, perfect.

[monu]

this shows an error of... Undefined function 'times' for input arguments of type 'cell' . . plz help me for element by element multiplication ,subtraction ,addition,power,,,,

Answer 2

[Sean de Wolski]

If you have the Neural Networks Toolbox:

doc gmultiply

And specifically

Cm = gmultiply(A',B);

[Duvarakesh KR]

if i use this logic in my program.i got error like "Sparse integer array arithmetic operation in not supported" please help help