PGPLOT Module: PGERRX -- horizontal error bar


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)