Move all the values of matrix starting from particular row of matrix and replace by zeros

Hello,

I have matrix A 343x9(attached with this thread). I want to check the condition A(k,4)==A(k+1,2). If true, leave it as it is. If false, move the matrix by one row starting from this row and substitute the values of the row by zeros. The challenge is that the matrix size is going to change.

The output is expected to be like:

20  303.679200000000  154.555100000000  303.794200000000  151.565800000000  0  0  2.99151123848801  70
21  303.794200000000  151.565800000000  305.288900000000  146.046900000000  0  0  5.71772553556046  70
22  305.288900000000  146.046900000000  306.553600000000  142.367700000000  0  0  3.89049851947021  70
23  306.553600000000  142.367700000000  301.609600000000  140.298100000000  0  0  5.35969963337501  70
24  301.609600000000  140.298100000000  299.080200000000  139.033300000000  0  0  2.82799989391797  70
25  299.080200000000  139.033300000000  297.010600000000  138.228500000000  0  0  2.22057361958570  70
0  0                  0                  0                  0                  0  0  0                       0  
26  518.224900000000  225.150500000000  507.187100000000  230.324500000000  0  0  12.1902955189774  70
27  507.187100000000  230.324500000000  505.002600000000  236.763100000000  0  0  6.79908892499577  70
28  505.002600000000  236.763100000000  503.507900000000  239.982500000000  0  0  3.54945974058021  70
29  503.507900000000  239.982500000000  501.898200000000  244.696500000000  0  0  4.98125788230243  70
30  501.898200000000  244.696500000000  499.483700000000  250.330300000000  0  0  6.12939741654920  70

Answer 1

[Jan]

Index = cumsum([1; 1 + (A(1:end-1, 4) ~= A(2:end, 2))]);
B(Index, :) = A;

[Andrei Bobrov]

+1