Name:         PGERRY

Purpose:      vertical error bar

Category:     GRAPHICS

File:         pgplot.src

Author:       T.J. Pearson

Use:          see description below.

Description:

            SUBROUTINE PGERRY (N, X, Y1, Y2, T)
            INTEGER N
            REAL X(*), Y1(*), Y2(*)
            REAL T
      
       Plot vertical 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
       PGERRX is required.
      
       Arguments:
        N      (input)  : number of error bars to plot.
        X      (input)  : world x-coordinates of the data.
        Y1     (input)  : world y-coordinates of top end of the
                          error bars.
        Y2     (input)  : world y-coordinates of bottom end of the
                          error bars.
        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 X, Y1, and Y2 must be greater
       than or equal to N. If N is 1, X, Y1, and Y2 may be scalar
       variables or expressions, eg:
             CALL PGERRY(1,X,Y+SIGMA,Y-SIGMA)

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