MATLAB: How to combine array or matrix??

matrix arraymatrix manipulation

i have problem on combine a few matrix into one. For example matrix with (1,3),(1,4),(1,1) and (1,2) into (1,n). The number of matrix is generated randomly and the size of matrix also is randomly. If i used zeros matrix and save all the matrix into it, how am i suppose to know the total size of zeros matrix that i have to create? is there any other way to solve this proble?? thank you..

Best Answer

How do you store the set of matrices? If they are stored in a cell:

C = {rand(1, 3), rand(1,4), rand(1,1), rand(1,2)};
D = cat(2, C{:});

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MATLAB: How can transform matrix??

[n,m]=size(A)
C=reshape(B(sub2ind([n,m],(1:n)'*ones(1,m),A)),n,m)

MATLAB: Avoid squeeze of a matrix??

Matlab's convention is to not show trailing singleton dimensions, but that doesn't mean they don't exist (this is different from squeeze, which actually permutes the dimensions of the matrix).

In your case, you can still work with B as it is; any operations that require those trailing dimensions still work. For example:

a = rand(2, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 2);
b = sum(a, 12);
c = cat(12, a, b);
>> size(a)
ans =
       2     1     1     2     1     1     1     1     1     1     1     2
>> size(b)
ans =
       2     1     1     2
>> size(c)
ans =
       2     1     1     2     1     1     1     1     1     1     1     3

Best Answer

Related Solutions

MATLAB: How can transform matrix??

MATLAB: Avoid squeeze of a matrix??

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