int Krigingx(double **ppredictions, double **perror, double *x, double *y, double *observations, int n_obs, double *x_interp, double *y_interp, int n_interp, Options *options)
int pKrigingx(double **ppredictions, double **perror, double *x, double *y, double *observations, int n_obs, double *x_interp, double *y_interp, int n_interp, Options *options)