| 
            plstransform
          ( | coordinate_transform , | 
| coordinate_transform_data ); | 
This function can be used to define a coordinate transformation
    which affects all elements drawn within the current plot window.  The
    coordinate_transformplmap and plmeridians
    functions.  The
    coordinate_transform_datacoordinate_transform
coordinate_transform
          (PLTRANSFORM_callbackA callback function that defines the transformation from
	  the input (x, y) world coordinates to new PLplot world coordinates.  If
	  coordinate_transform is not supplied (e.g., is
	  set to NULL in the C case), then no transform is applied.
coordinate_transform_data
          (PLPointer
            Optional extra data for
            
              .
          coordinate_transform
            
Redacted form:
            General: plstransform(coordinate_transform, coordinate_transform_data)
          
This function is used in examples 19 and 22.