vis/lineplots/

mg_ternaryplot.pro

Examples

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

  IDL> .run mg_ternaryplot

The first example does:

  d = read_csv(filepath('ternary_data.txt', root=mg_src_root()))
  mg_ternaryplot, d.field2, d.field3, d.field4, psym=!mg.psym.triangle, $
                  color='000000'x, background='ffffff'x, $
                  atitle='aerosol single scattering albedo', $
                  btitle='Angstrom exponent', $
                  ctitle='back-scattering fraction'

This should produce the following:

The next example does:

  n = 1000L
  a = randomu(seed, n)
  b = randomu(seed, n)
  c = randomu(seed, n)
  mg_ternaryplot, color='000000'x, background='ffffff'x, /nodata, $
                  atitle='A', btitle='B', ctitle='C'
  mg_ternaryplot, a + 2., b, c, psym=!mg.psym.plussign, symsize=0.5, $
                  color=rgb[0], /overplot
  mg_ternaryplot, a, b + 2., c, psym=!mg.psym.plussign, symsize=0.5, $
                  color=rgb[1], /overplot
  mg_ternaryplot, a, b, c + 2., psym=!mg.psym.plussign, symsize=0.5, $
                  color=rgb[2], /overplot
  mg_ternaryplot, a + 1., b, c + 2., psym=!mg.psym.plussign, $
                  symsize=0.5, color=rgb[3], /overplot
  mg_ternaryplot, a, b + 2., c + 1., psym=!mg.psym.plussign, $
                  symsize=0.5, color=rgb[4], /overplot
  mg_ternaryplot, a + 2., b + 1., c, psym=!mg.psym.plussign, $
                  symsize=0.5, color=rgb[5], /overplot

It should produce the following:

Routines

top mg_ternaryplot

mg_ternaryplot, a, b, c [, atitle=string] [, btitle=string] [, ctitle=string] [, xmargin=fltarr(2)] [, ymargin=fltarr(2)] [, /overplot] [, /nodata] [, _extra=keywords]

Create a ternary plot.

Parameters

a in required type=fltarr

closer to lower left indicates higher a value

b in required type=fltarr

closer to lower right indicates higher b value

c in required type=fltarr

closer to upper middle indicates higher c value

Keywords

atitle in optional type=string: title for a values
btitle in optional type=string: title for b values
ctitle in optional type=string: title for c values
xmargin in optional type=fltarr(2): x-margins for plot in units of characters
ymargin in optional type=fltarr(2): y-margins for plot in units of characters
overplot in optional type=boolean: set to overplot on a previously setup coordinate system
nodata in optional type=boolean: set to create a coordinate system without plotting any data
_extra in optional type=keywords: keywords for PLOT, PLOTS, and XYOUTS

File attributes

Modification date:	Wed May 14 15:07:15 2014
Lines:	103
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