NAME

       plcont - Contour plot

SYNOPSIS

       plcont(f, nx, ny, kx, lx, ky, ly, clevel, nlevel, pltr, pltr_data)

DESCRIPTION

       Draws  a  contour plot of the data in f[nx][ny], using the nlevel contour levels specified
       by clevel. Only the region of the array from kx to lx and from ky to ly is plotted out.  A
       transformation  routine  pointed  to  by pltr with a pointer pltr_data for additional data
       required by the transformation routine is used to map indices  within  the  array  to  the
       world  coordinates.   See  the  following  discussion  of  the  arguments  and  the PLplot
       documentation for more information.

       Redacted form: [PLEASE UPDATE! ONLY PERL INFO IS LIKELY CORRECT!] F95: plcont(f,  kx,  lx,
       ky,  ly, clevel, tr?) or plcont(f, kx, lx, ky, ly, clevel, xgrid, ygrid) Java: pls.cont(f,
       kx, lx, ky, ly, clevel, xgrid, ygrid) Perl/PDL: plcont(f, kx, lx, ky,  ly,  clevel,  pltr,
       pltr_data) Python: plcont2(f, kx, lx, ky, ly, clevel)

       This function is used in examples 9,14,16,22.

ARGUMENTS

       f (const PLFLT * const *, input)
              Pointer to a vectored two-dimensional array containing data to be contoured.

       nx, ny (PLINT, input)
              Physical dimensions of array f.

       kx, lx (PLINT, input)
              Range of x indices to consider.

       ky, ly (PLINT, input)
              Range of y indices to consider.

       clevel (const PLFLT *, input)
              Pointer to array specifying levels at which to draw contours.

       nlevel (PLINT, input)
              Number of contour levels to draw.

       pltr (void (*) (PLFLT, PLFLT, PLFLT *, PLFLT *, PLPointer) , input)
              Pointer  to function that defines transformation between indices in array f and the
              world coordinates (C only).  Transformation functions are provided  in  the  PLplot
              library: pltr0(3plplot) for identity mapping, and pltr1(3plplot) and pltr2(3plplot)
              for arbitrary mappings respectively defined by one- and two-dimensional arrays.  In
              addition,  user-supplied  routines  for  the  transformation  can  be used as well.
              Examples of all of these approaches are given  in  the  PLplot  documentation.  The
              transformation  function  should  have  the  form  given  by any of pltr0(3plplot),
              pltr1(3plplot), or pltr2(3plplot). Note that unlike plshades(3plplot)  and  similar
              PLplot  functions which have a pltr argument, plcont requires that a transformation
              function be provided in the C interface.  Leaving  pltr  NULL  will  result  in  an
              error.

       pltr_data (PLPointer, input)
              Extra  parameter  to  help  pass  information  to  pltr0(3plplot),  pltr1(3plplot),
              pltr2(3plplot), or whatever routine that is externally supplied.

AUTHORS

       Many developers  (who  are  credited  at  http://plplot.sourceforge.net/credits.php)  have
       contributed to PLplot over its long history.

SEE ALSO

       PLplot documentation at http://plplot.sourceforge.net/documentation.php.

                                          February, 2016                          PLCONT(3plplot)