Name:         PGERRX

Purpose:      horizontal error bar

Category:     GRAPHICS

File:         pgplot.src

Author:       T.J. Pearson

Use:          see description below.

Description:

            SUBROUTINE PGERRX (N, X1, X2, Y, T)
            INTEGER N
            REAL X1(*), X2(*), Y(*)
            REAL T
      
       Plot horizontal error bars.
       This routine draws an error bar only; to mark the data point in
       the middle of the error bar, an additional call to PGPT or
       PGERRY is required.
      
       Arguments:
        N      (input)  : number of error bars to plot.
        X1     (input)  : world x-coordinates of lower end of the
                          error bars.
        X2     (input)  : world x-coordinates of upper end of the
                          error bars.
        Y      (input)  : world y-coordinates of the data.
        T      (input)  : length of terminals to be drawn at the ends
                          of the error bar, as a multiple of the default
                          length; if T = 0.0, no terminals will be drawn.
      
       Note: the dimension of arrays X1, X2, and Y must be greater
       than or equal to N. If N is 1, X1, X2, and Y may be scalar
       variables, or expressions, eg:
             CALL PGERRX(1,X-SIGMA,X+SIGMA,Y)

Updates:      Oct 16, 1998: JPT automatically extracted from source.