# ncl_tdprpa (3) - Linux Manuals

## ncl_tdprpa: Given the parallelogram coordinates of a point, get the coordinates

## NAME

TDPRPA - Given the parallelogram coordinates of a point, get the coordinates of its projection in the projection plane. This routine is essentially the inverse of the routine TDPRPI.

## SYNOPSIS

CALL TDPRPA (XIPA, YIPA, XI2D, YI2D)## C-BINDING SYNOPSIS

#include <ncarg/ncargC.h>void c_tdprpa(float xipa, float yipa, float *xi2d, float *yi2d)

## DESCRIPTION

The arguments of TDPRPA are as follows:

- XIPA and YIPA
- (input expressions of type REAL) - the parallelogram coordinates of a point. (The parallelogram is as defined by a prior call to TDPARA.)
- XI2D and YI2D
- (output variables of type REAL) - the coordinates of the projection of the point in the projection plane.

## C-BINDING DESCRIPTION

The C-binding argument descriptions are the same as the FORTRAN argument descriptions.## ACCESS

To use TDPRPA or c_tdprpa, load the NCAR Graphics libraries ncarg, ncarg_gks, and ncarg_c, preferably in that order.## COPYRIGHT

Copyright (C) 1987-2009University Corporation for Atmospheric Research

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