How to find variance between two rows in array

Sir.i found the zeros location of my 1269*100 array structure and the output is 1*1269 array structure.now I need to find the variance between two rows which has the same zero location.example:[1 2 4 4 4 ] is the zeros Location.so from this 3,4,5 row has same zeros location.so I found different between 4th,3rd row and 5th,4th row and store the variance value in 3 rd,4th row .