i need to convert below batrix to another matrix

 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

[Walter Roberson]

Is it correct that the rule is that each row should have all negative values removed, and then all rows should be padded out with 0 to the length of the longest remaining row ?

Answer 1

[KSSV]

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

[Walter Roberson]

Should be b>=0 as row 2 shows an example of a 0 being preserved.

Answer 2

[Nitin Sapre]

Yes sir that's what I need