To identify rows of a matrix where column 8 is less than 3 and column 6 is not zero,
rowIdx = (matrix(:,8) < 3) & (matrix(:,6) ~= 0);
where 'rowIdx' is a vector of row numbers that satisfy those conditional statements.
To remove those rows from the matrix,
matrix(rowIdx, :) = [];
To identify rows of at matrix where column 8 is less than 3 and column 6 is equal to zero,
rowIdx2 = (matrix(:,8) < 3) & (matrix(:,6) == 0);
