extern void initval( float *p[], float *rhs[], int nrows, int ncols,
		      float pborder, float pinside, float rhsborder, float rhsinside );
	extern void allocate( int nrows, int ncols, float **pcop, float **corhs );
	extern void upload( float *p[], float *rhs[], int nrows, int ncols,
		      float *cop, float *corhs );
	extern void download( float *p[], float *rhs[], int nrows, int ncols,
		      float *cop, float *corhs );
	extern void poissn( float *p[], float *rhs[], float **pcop, int icop, float *corhs, int nrows, int ncols, 
		      float delx, float dely, float addcoeff[] );