Name: PGERR1 Purpose: horizontal or vertical error bar Category: GRAPHICS File: pgplot.src Author: T.J. Pearson Use: see description below. Description: SUBROUTINE PGERR1 (DIR, X, Y, E, T) INTEGER DIR REAL X, Y, E REAL T Plot a single error bar in the direction specified by DIR. This routine draws an error bar only; to mark the data point at the start of the error bar, an additional call to PGPT is required. To plot many error bars, use PGERRB. Arguments: DIR (input) : direction to plot the error bar relative to the data point. One-sided error bar: DIR is 1 for +X (X to X+E); 2 for +Y (Y to Y+E); 3 for -X (X to X-E); 4 for -Y (Y to Y-E). Two-sided error bar: DIR is 5 for +/-X (X-E to X+E); 6 for +/-Y (Y-E to Y+E). X (input) : world x-coordinate of the data. Y (input) : world y-coordinate of the data. E (input) : value of error bar distance to be added to the data position in world coordinates. 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. Updates: Oct 16, 1998: JPT automatically extracted from source.