MATLAB: Add zero rows to a matrix

matrix array

Hi, I have the matrix A:
A=[1  5;
   2  4;
   4  9;
   6  3;]
All the elements of the 1st column are integer and arranged ascendingly but there is a jump somewhere (from row 2 to 4 missing 3 and from 4 to 6 missing 5). I want to add zero rows wherever there is jump in the 1st column to become:
A=[1  5;
   2  4;
   0  0;
   4  9;
   0  0;
   6  3;]
Thanks in advance

Best Answer

A=[1 5; 2 4; 4 9; 6 3]
A(logical(accumarray(A(:,1),1)),:)=A
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