If in a matrix, m ??? n, then it is a rectangular matrix.If in a matrix, m=n, then it is a square matrix.If a matrix contains only one row, (i.e. 1xn matrix), then it is a row matrix.If a matrix contains only 1 column, (i.e. mx1 matrix), then it is a column matrix.A matrix whose every element is zero is a zero matrix.A square matrix is called a diagonal matrix if all its elements other than the el