i have 50x5 matrix, i want to delete some of the rows but unfortunately the rows which i want to delete are not at equal interval,so i need help

i want delete the rows which contains first two rows and last 3 rows of every constant value of 1st column 3 zeros.

Answer 1

[the cyclist]

If you have loaded the data into a matrix "M", then you can do this with

deleteRowIndex = ismember(M(:,end-2:end),[0 0 0],'rows');
M(deleteRowIndex,:) = [];

This takes advantage of the fact that the rows you want to delete are of the form

[a b 0 0 0]