MATLAB: Reshaping (M,N)-matrix to (M,1)-matrix

columnmatrixrowvector

Hello everyone,
I have a matrix, for example:
A = [1, 2, 3;
   4, 5, 6;
   7, 8, 9]
and now I want to create a matrix:
A = [123;
   456; 
   789]
Does anybody know how I can do this efficiently?
(I need to do this 62.000 times for my matrix)

Best Answer

z = floor(log10(A)+1);
z(isinf(z)) = 1;
ex = fliplr(cumsum([zeros(size(A,1),1), fliplr(z(:,2:end))],2));
out = sum(A.*10.^ex,2);
eg:
> A =[14 10 3    16
  12  0  10   18
  3   11 14   7
  9   13 0   20];
> z = floor(log10(A)+1);
> z(isinf(z)) = 1;
> ex = fliplr(cumsum([zeros(size(A,1),1), fliplr(z(:,2:end))],2));
> out = sum(A.*10.^ex,2)
out =
       1410316
       1201018
        311147
        913020
Related Question