directgraphics/

vis_contour.pro

direct graphics

includes main-level program

Wrapper for CONTOUR that handles the NLEVELS keyword better: if LEVELS is not specified then NLEVELS contour levels are created equally spaced between the minimum and maximum values of z. The levels used can also be returned to the caller by passing a named variable to LEVELS.

Examples

Try the main-level example program at the end of this file:

  IDL> .run vis_contour

This should produce something like:

After reading in the elevbin.dat dataset, the pertinent commands are:

  IDL> vis_contour, data, /fill, nlevels=15, xstyle=1, ystyle=1, $
       title='VIS_CONTOUR'
  IDL> vis_contour, data, /overplot, nlevels=15, levels=levels, $
       /follow, /downhill
  IDL> print, 'Levels used in VIS_CONTOUR: ' $
         + strjoin(strtrim(levels, 2), ', ')

top vis_contour

vis_contour, z [, x] [, y] [, nlevels=integer] [, levels=fltarr] [, _extra=keywords]

Produce a contour plot.

Parameters

z in required type=fltarr(m, n)

2-dimensional array to be plotted

x in optional type=fltarr(m)

values for x-axis

y in optional type=fltarr(n)

values for y-axis

Keywords

nlevels in optional type=integer default=6: number of contour levels
levels in out optional type=fltarr: values for isocline levels; specified values are used if present, set to a named variable to output the used levels if not
_extra in optional type=keywords: keywords to CONTOUR

File attributes

Modification date:	Mon Nov 29 18:32:39 2010
Lines:	96
Docformat:	rst rst

API documentation for visualization library

Michael Galloy