# ncl_tdsort (3) - Linux Man Pages

## ncl_tdsort: A generic sorting routine, normally used indirectly (by calling the

## NAME

TDSORT - A generic sorting routine, normally used indirectly (by calling the routine TDOTRI).

## SYNOPSIS

CALL TDSORT (RWRK, NRWK, IORD, IWRK)## C-BINDING SYNOPSIS

#include <ncarg/ncargC.h>void c_tdsort(float *rwrk, int nwrk, int iord, int *iwrk)

## DESCRIPTION

This is an internal routine used for sorting. Originally, it was not intended that a user should call this routine directly, but doing so will do no harm. Given an array of NRWK reals in an array RWRK and an "ordering flag" IORD, TDSORT returns a permutation vector IWRK such that, for every I and J such that 1.LE.I.LE.J.LE.NWRK, if IORD is zero, then RWRK(IWRK(I)).LE.RWRK(IWRK(J)), else RWRK(IWRK(I)).GE.RWRK(IWRK(J)).The arguments of TDSORT are as follows:

- RWRK
- (an input array, of type REAL, dimensioned NWRK) - an array of NWRK real numbers that are to be sorted. The contents of RWRK are returned unchanged; the ordering is as specified by the contents of the array IWRK.
- NWRK
- (an input expression of type INTEGER) - the dimension of RWRK (and of IWRK).
- IORD
- (an input expression of type INTEGER) - if IORD is zero, the desired ordering is from smallest numeric value to largest; otherwise, the desired ordering is from largest value to smallest.
- IWRK
- (an output array of type INTEGER, dimensioned at least NWRK) - returned containing a permutation of the integers from 1 to NWRK.

## C-BINDING DESCRIPTION

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

To use TDSORT or c_tdsort, 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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