I got error information now, but not last year. Seemingly it is because the code is not consistent with the new Matlab version (2011a). Maybe I am wrong. Do you have ideas about this? The error is as following:
??? Error using ==> mldivide
MLDIVIDE is not supported for one sparse input and one single input.
Error in ==> gridfit at 616
zgrid = reshape(A\rhs,ny,nx);