Plotting Error Bars In Idl
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Toolkit APIs ENVI API ESE API Libraries Astronomy Library Beaumont Library Bowman Library Catalyst Library Coyote Library Dáithí Library Galloy Library JBIU Library JHUAPLS1R Library Mankoff idl oploterr Library Markwardt Library Motley Library Salvaggio Library ENVI Using ENVI idl ploterr Modules Atmospheric Correction DEM Extraction ENVI Photogrammetry Feature Extraction (FX) NITF ENVI API ESE Using ENVI Services Engine ploterror idl ENVI Services Engine API ENVI for ArcGIS@ Services Edition Resources Licensing PDF Guides Platform Support Harris Geospatial/Docs Center/IDL Reference/New Graphics/ERRORPLOT ERRORPLOT ERRORPLOT The ERRORPLOTfunction draws a simple line plot, with
Oploterror Idl
error bars surrounding each vertex. You can create plots with both symmetric and asymmetric error bars. Example The following lines create the plot shown at the right. y = [20.1, 19.9, 20.0, 20.0, 19.9, 20.0] yerror = [0.329, 0.186, 0.147, 0.086, 0.234, 0.196] x = INDGEN(6)+1 ; Create the plot p = ERRORPLOT(x, y, yerror, XRANGE=[0,7], $ XTITLE="Day", YTITLE="Distance idl errplot (miles)", $ TITLE="Average distance bears walk in a day") ; Set some properties p.THICK=2 p.ERRORBAR_THICK=2 p.SYM_COLOR ="cornflower" p.ERRORBAR_COLOR="indian_red" p.ERRORBAR_CAPSIZE=0.5 Additional Examples See Plot examples for additional examples using the ERRORPLOTfunction. Syntax graphic = ERRORPLOT(Y, Yerror [, Format] [, Keywords=value] [, Properties=value]) graphic = ERRORPLOT(X, Y, Xerror, Yerror [, Format] [, Keywords=value] [, Properties=value]) graphic = ERRORPLOT(X, Y, Yerror [, Format] [, Keywords=value] [, Properties=value]) Keywords Keywords are applied only during the initial creation of the graphic. AXIS_STYLE=value /BUFFER, /CURRENT, /DEVICE, DIMENSIONS=[width, height], LAYOUT=array, LOCATION=[x, y], MARGIN=scalar or [left, bottom, right, top], /NO_TOOLBAR, /NODATA, /OVERPLOT, /WIDGETS Properties Properties can be set as keywords to the function during creation, or retrieved or changed using the "." notation after creation. ANTIALIAS, ASPECT_RATIO, AXES, BACKGROUND_COLOR, BACKGROUND_TRANSPARENCY, CLIP, COLOR, CROSSHAIR, ERRORBAR_CAPSIZE, ERRORBAR_COLOR, ERRORBAR_LINESTYLE, ERRORBAR_THICK, FILL_BACKGROUND, FILL_COLOR, FILL_LEVEL, FILL_TRANSPARENCY, FONT_COLOR, FONT_NAME, FONT_SIZE, FONT_STYLE, HIDE, LINESTYLE, NAME, POSITION, RGB_TABLE, SYM_COLOR, SYM_FILLED, SYM_FILL_COLOR, SYM_INCREMENT, SYMBOL, SYM_SIZE, SYM_THICK, SYM_TRANSPARENCY, THICK, TITLE, TRANSPARENCY, UVALUE, VERT_COLORS, WINDOW, WINDOW_TITLE, XRANGE, YRANGE Methods Close ConvertCoord CopyWindow Delete Erase GenerateCode GetData GetValueAtLocation MapForward MapInverse Order Print Refresh Rotate Save Sca
probably out of luck here, given what goes in the IDL distribution. error bars But others have run up against this problem, too. Check out the routines PlotErrorand OplotErr in the NASA Astronomy Library. These routines have modified the standard IDL routines to allow plotting error bars error bars in either direction. Moreover, the routines have additional options, such as NAN value recogntion, plotting only every nth error bar, and the NSum keyword that make them even more useful. Error bars can also be created on plots using the ERR_* keywords available on the cgPlot command. You can find IDL code and see an example of this in the Errorbar_Plot example in the Coyote Plot Gallery. [Return to IDL Programming Tips] Copyright © 1997-2013 David W. Fanning Last Updated 10 December 2013