MATLAB: Could anyone tell me what command can be used to return the row size of the matrix.

row size

could anyone tell me what command can be used to return the row size of the matrix.

size(A,1)

Try this wherever you want to report the number of rows:

message = sprintf('The number of rows = %d.\n', size(yourData));
fprintf('%s', message);
uiwait(helpdlg(message));

If that doesn't do it for you, then try this link

You are not asking to do a reshape, which does not change the total number of elements.

A = A(1,:);