Routines (alphabetical) > Routines: E > ERRPLOT Procedure

# ERRPLOT Procedure

Note: The new ERRORPLOT function 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 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 estimates, equal to data + error.

## Keywords

### WIDTH

The width of the error bars. The default is 1% of plot width.

### Graphics Keywords Accepted

See Graphics Keywords for the description of the following graphics and plotting keywords:

CLIP, COLOR, DATA, DEVICE, LINESTYLE, NOCLIP, NORMAL, PSYM, SYMSIZE, T3D, THICK, Z

## Version History

Original | Introduced

## See Also

ERRORPLOT, OPLOTERR Procedure, PLOT Procedure, PLOTERR Procedure