Calling up automatically created matrix i in matlab

Hi All,

I have a situation where I have created a matrix A(1) to A(n), also B(1) to B(n).

I used the following to create these matrices:

tmpl='A';

for i=1:n

      m=sprintf('%s%2.3d=%insert function;',tmpl,i);

eval(m)
end

NOTE: so, A1 to An is created. If there is a better way of doing this, please advise...

The next step is where I need to multiply these matrices in a loop, see example:

for i=1:n

      C(i) = B(i)*A(i)
  end

NOTE: All the matrices are the same size.

so, basically if anyone can help and explain how to call up a matrix that was created automatically according to the value of i=1 to n I think I will be able to continue.

NOTE: If there is a better way of doing the same thing, please do tell.

Much appreciated,

G.D

Answer 1

[Jan]

This is a really, really bad idea. The automagic creation of variables is hard to read, in consequence hard to debug and in reduces the processing speed massively.

For an alternative, see: http://www.mathworks.com/matlabcentral/answers/57445-faq-how-can-i-create-variables-a1-a2-a10-in-a-loop :

 Use A{1}, A{2}, ... instead
 or in your case A(:, :, i) would be working also.

[Khrismayanti Dewi Adam]

hi, i have pretty same questions, i have matrix A = [2 3 4 0 0 0 1; 5 6 0 0 9 0 0] then i want to split it become A1 and A2, then removes the zero. so my expected output is

A1 = [2 3 4 1] A2 = [5 6 9]

thank you

[Walter Roberson]

Please read the link that Jan provided... and please do not create your variables that way.

B = mat2cell(A,ones(1,size(A,1)), size(A,2));
C = cellfun(@(v) v(v~=0), B, 'Uniform', 0);

[Image Analyst]

GD's "Answer" moved here. I also "Accepted" Jan's Answer for GD since GD said Jan's answer worked perfectly:

Works perfectly!!!!!!

Thanks! GD