| 
	    plAlloc2dGrid
	  ( | f, | 
| nx, | |
| ny ); | 
      Allocates the memory for a matrix of type PLFLT_MATRIX (organized as an Iliffe column
      vector of pointers to row vectors).  As a result the matrix
      can be accessed using C/C++ syntax like *f[i][j]. The
      memory associated with this matrix must be freed by calling
      plFree2dGrid once it is no longer required.
    
f
	  (PLFLT_NC_MATRIX *If the allocation is a success, a pointer to a matrix
	  (organized as an Iliffe column
	  vector of pointers to row vectors) is returned.  If the
	  allocation is a failure, then the returned value of
	  f will be NULL.
nx, ny
	  (PLINTDimensions of matrix to be allocated.
This function is used in our C (and C++) examples 8, 9, 11, 14, 16, 20, 21, 22, 28, 30.