# ncl_tdprpa man page

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.

## See Also

Online: tdclrs, tdctri, tddtri, tdgeti, tdgetr, tdgrds, tdgrid, tdgtrs, tdinit, tditri, tdlbla, tdlbls, tdline, tdlnpa, tdmtri, tdotri, tdpack, tdpack_params, tdpara, tdplch, tdprpi, tdprpt, tdseti, tdsetr, tdsort, tdstri, tdstrs

## Copyright

Copyright (C) 1987-2009

University Corporation for Atmospheric Research

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