Instead of
coder.target('sfun')
you probably meant
coder.target('matlab')
in the latest release. In older releases you would have used
isempty(coder.target)
That said, even after you make this change, your invocation still will not work:
Pts_out = coder.ceval('MLSsubroutine_C',Pts_in, Pts_ctrl_in, Pts_ctrl_out, 2, D_hnd_mesh);
coder.ceval is expecting a C call that works with the raw data and not with mxArrays.
You can resolve this in two ways. Refactor your C code into a kernel that does not use mxArrays and a wrapper that converts from mxArrays to raw data, and then call the kernel using coder.ceval. Alternatively, you can write a raw function wrapper that creates mxArrays from the raw data and then calls mexFunction. If both seem equally easy to you, the former is clearly to be preferred.
Good luck,
Fred
