%ROWS Counts the number of rows in a matrix.
% ROWS(X) is the number of rows in matrix X.
% See also COLS.
% Details are to be found in Mastering Mechanics I, Douglas W. Hull,
% Prentice Hall, 1998
% Douglas W. Hull, 1998
% Copyright (c) 1998-99 by Prentice Hall
% Version 1.00