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.
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]
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.
A vector of lower estimates, equal to data - error.
A vector of upper estimates, equal to data + error.
The width of the error bars. The default is 1% of plot width.
See Direct Graphics Keywords for the description of the following graphics and plotting keywords:
CLIP, COLOR, DATA, DEVICE, LINESTYLE, NOCLIP, NORMAL, PSYM, SYMSIZE, T3D, THICK, Z
To plot symmetrical error bars where Y is a vector of 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
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