vis/directgraphics/

mg_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 mg_contour

This should produce something like:

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

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

Routines

top mg_contour

mg_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:	Wed May 14 15:07:15 2014
Lines:	30
Docformat:	rst rst

Personal library of Michael Galloy
Contact me if you have enhancement requests or bug fixes.

mglib

Personal IDL library for M. Galloy