Plotting In Idl With Error Bars
Contents |
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 idl oploterr Mankoff 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/Direct Graphics/ERRPLOT Procedure ERRPLOT Procedure ERRPLOT Procedure Note: The new ERRORPLOT function
Oploterror Idl
has replaced much of the functionality of the ERRPLOT procedure. The ERRPLOT procedure plots error bars over a previously drawn plot. This routine is written in the IDL language. Its source code can be found in the file errplot.pro in the lib subdirectory of the IDL distribution. Examples To plot symmetrical error bars where Y is a vector of idl errplot data values and ERR is a symmetrical error estimate, enter: ; Plot data: PLOT, Y ; Overplot error bars: ERRPLOT, Y-ERR, Y+ERR If error estimates are non-symmetrical, provide actual error estimates in the upper and lower arguments. ; Plot data: PLOT,Y ; Provide custom lower and upper bounds: ERRPLOT, lower, upper To plot Y versus a vector of abscissas: ; Plot data (X versus Y): PLOT, X, Y ; Overplot error estimates: ERRPLOT, X, Y-ERR, Y+ERR Syntax ERRPLOT, [ X, ] Low, High [,WIDTH=value] Graphics Keywords: [,CLIP=[X0, Y0, X1, Y1]] [,COLOR=value] [,/DATA | , /DEVICE | , /NORMAL] [,LINESTYLE={0 | 1 | 2 | 3 | 4 | 5}] [,/NOCLIP] [,PSYM=integer{0 to 10}] [,SYMSIZE=value] [,/T3D] [,THICK=value] [,Z=value] Arguments X A vector containing the abscissa values at which the error bars are to be plotted. X only needs to be provided if the abscissa values are not the same as the index numbers of the plotted points. Low A vector of lower estimates, equal to data - error. High A vector of upper est
Toolkit APIs ENVI API ESE API Libraries Astronomy Library Beaumont Library Bowman Library Catalyst
Idl Horizontal Error Bars
Library Coyote Library Dáithí Library Galloy Library JBIU Library JHUAPLS1R
Psym Idl
Library Mankoff Library Markwardt Library Motley Library Salvaggio Library ENVI Using ENVI Modules idl cgplot Atmospheric Correction DEM Extraction ENVI Photogrammetry Feature Extraction (FX) NITF ENVI API ESE Using ENVI Services Engine ENVI Services Engine API ENVI for ArcGIS@ http://www.harrisgeospatial.com/docs/ERRPLOT_Procedure.html 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 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 http://www.harrisgeospatial.com/docs/ERRORPLOT.html 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 (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
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 in idl 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