How do I check if an input argument is empty in a MEX file in MATLAB 7.10 (R2010a)?

I would like to check if an input argument is empty in a MEX file. This is similar to using the ISEMPTY function in MATLAB.

Answer 1

[MathWorks Support Team]

The following command can be used to check if an argument is empty by checking if the dimension is zero.

if (mxGetM(prhs[i]) == 0 && mxGetN(prhs[i]) == 0)

        mexErrMsgTxt("Empty argument.");

[James Tursa]

From the mxGetN documentation:

If pm is an N-dimensional mxArray, mxGetN is the product of dimensions 2 through N.

So, the above answer is not wrong for the usage of mxGetN( ). However, it is wrong as you point out for the usage of && ... it should be || instead.