MATLAB: I need to convert below batrix to another matrix

convertionMATLAB

 b=[308 -1 2 3 -1 2 -1;
      -1 -1 2 1 0 1 0;
      1 2 -1 -1 -1 -1 2;
       0 0 1 -1 -1 2 -1];
to
b=[308  2 3  2 ;
     2 1 0 1 0;
    1 2 2;
    0 0 1  2 ]
fill all ending elements with 0 
 b=[308  2 3  2 0 ;
       2     1 0 1 0;
      1      2 2 0 0;
      0      0 1  2 0]
thanks

Best Answer

b=[308 -1 2 3 -1 2 -1;
      -1 -1 2 1 0 1 0;
      1 2 -1 -1 -1 -1 2;
       0 0 1 -1 -1 2 -1]; 
       
% Get positive count from each row 
N = sum(b>0,2) ; 
iwant = zeros(size(b,1),max(N)) ; 
for i = 1:size(b,1)
  bi = b(i,:) ; 
  iwant(i,1:N(i)) = bi(bi>0) ; 
for
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