CPRECT - Initializes the contouring of a rectangular array of data.

       To use CPRECT or c_cprect, load the NCAR Graphics libraries ncarg, ncarg_gks, and ncarg_c, preferably  in
       that order.

       The  C-binding argument descriptions are the same as the FORTRAN argument descriptions with the following
       exceptions:

       zdat(l,kzdt)
                   zdat is dimensioned l by kzdt, where l ≥ nzdt.

       kzdt        The second dimension of the array zdat.

       mzdt        The second dimension of the array of data in zdat. mzdt ≤ kzdt.

       nzdt        The first dimension of the array of data in zdat. nzdt ≤ l, where l  is  the  declared  first
                   dimension of the array zdat.

       #include <ncarg/ncargC.h>

       void c_cprect (float *zdat, int kzdt, int mzdt, int nzdt,
       float *rwrk, int lrwk, int *iwrk, int liwk)

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

       The use of this Software is governed by a License Agreement.

UNIX                                               March 1993                                     CPRECT(3NCARG)

       ZDAT        (REAL  array, dimensioned KZDT x n, where "n" is greater than or equal to NZDT, input) is the
                   array of data to be contoured.

       KZDT        (INTEGER, input) is the first dimension of the array ZDAT.

       MZDT        (INTEGER, input) is the first dimension of the array of data in ZDAT. MZDT must be less  than
                   or equal to KZDT.

       NZDT        (INTEGER, input) is the second dimension of the array of data in ZDAT. NZDT must be less than
                   or equal to the declared second dimension of the array ZDAT.

       RWRK        (REAL array, dimensioned LRWK, input/output) is the real work array.

       LRWK        (INTEGER, input) is the length of RWRK.

       IWRK        (INTEGER array, dimensioned LIWK, input/output) is the integer work array.

       LIWK        (INTEGER, input) is the length of IWRK.

       Use the ncargex command to see the following relevant examples: caredg, ccpback, ccpcff, ccpcfx, ccpcica,
       ccpci, ccpcis, ccpcit, ccpclc, ccpcld, ccpcldm, ccpcldr, ccpcll, ccpclu, ccpdflt, ccpfil, ccpga, ccphand,
       ccphcf,  ccphl, ccphlt, ccpila, ccpils, ccpilt, ccpklb, ccplbam, ccplbdr, ccpllb, ccpllc, ccplll, ccpllo,
       ccpllp, ccpllt, ccpmap, ccpmovi, ccpmpxy, ccpncls, ccpnet, ccpnof, ccpnsd, ccppc, ccppc1, ccppc2, ccppc3,
       ccppc4, ccppkcl, ccppole, ccprc, ccprect, ccprwc, ccprwu,  ccpscam,  ccpset,  ccpspv,  ccpt2d,  ccptitle,
       ccpvp,  ccpvs,  cidsfft,  colcon, cpex01, cpex02, cpex03, cpex04, cpex05, cpex06, cpex07, cpex08, cbex01,
       vvex01, tconpa, fcover, ffex03, ffex05, fsfsgfa.

       CPRECT - Initializes the contouring of a rectangular array of data.

       Online:  conpack, cpback, cpchcf, cpchcl, cpchhl, cpchil, cpchll, cpcica, cpclam, cpcldm, cpcldr, cpcltr,
       cpcnrc, cpdrpl, cpezct, cpgetc, cpgeti, cpgetr, cplbam, cplbdr, cpmpxy, cpmviw, cpmvrw,  cppkcl,  cppklb,
       cprset, cpscae, cpsetc, cpseti, cpsetr, cpsps1, cpsps2, ncarg_cbind

       Hardcopy: NCAR Graphics Contouring and Mapping Tutorial

       CALL CPRECT (ZDAT, KZDT, MZDT, NZDT, RWRK, LRWK, IWRK, LIWK)

       The routine CPRECT is called to initialize the process of drawing a contour plot from a rectangular array
       of  data.   The  arguments define the data array, a real workspace array, and an integer workspace array.
       The dimensions of all the arrays are transferred to variables in COMMON,  so  that,  in  calls  to  other
       Conpack routines, those dimensions may be omitted.

       CPRECT  initializes  the  internal  pointers  that manage workspace use; also, it decides the appropriate
       ranges of X and Y coordinates for drawing contour lines and positioning labels.

       If Conpack is to call SET, appropriate arguments are determined and SET is called; otherwise,  GETSET  is
       called to retrieve the arguments from the user's call to SET.

       The list of label positions (if any) left over from previous calls to the package is discarded.

       If  contour  levels  are  to be chosen by Conpack, 'NCL' is zeroed so that the levels will be chosen when
       they are needed.

       The minimum and maximum values in the data array are located and it  is  decided  whether  the  data  are
       essentially constant.

       Numeric-label parameters that depend on the range of values in the data array are initialized.

       A scale factor may be chosen.