CALL: PLOT_ERROR_BAR
The center should be given as a pair of numbers or vectors.
All items specified as vectors must have the same length.
Items specified as numbers are expanded to vectors of the
same length as other vectors appearing in the argument list.
One can either specify only one set of error bars, in which case
the error bar will be symmetric, or two sets, in which case the
first set is taken to be the left resp. lower error whereas the
second set becomes the right resp. upper error.
Errors must always be specified by (x,y) pairs.
All errors specified as vectors must have the same length,
and they must also have the same length as (x,y). Errors specified
as numbers are expanded to vectors of the same length as other
vectors appearing in the argument list.
The following error bar types are currently available:
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Type Description
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CIRCLE A circle, filled according to fill-area ERROR-BAR and
a plus indicating the left, right, up and down errors
drawn with line type ERROR-BAR.
CROSS Like CIRCLE, but using an X instead of a circle. The
X is drawn with line type ERROR-BAR.
DAVID David's star, like a 6-STAR but fatter.
ELLIPSE An ellipse segment per quadrant, half axes corresponding
to the error components, filled with fill-area ERROR-BAR.
HEXAGON Like CIRCLE, but using a hexagon instead of a circle.
PLUS Only a + sign showing the 4 error components, lines
drawn according to line type ERROR-BAR.
4-STAR A star with 4 points, in other respects like CIRCLE.
6-STAR A star with 6 points, in other respects like CIRCLE.
8-STAR A star with 8 points, in other respects like CIRCLE.
10-STAR A star with 10 points, in other respects like CIRCLE.
SQUARE Like CIRCLE, but using a square box instead of a circle.
TRIANGLE Like CIRCLE, but using a triangle instead, 4 models can
be used: LEFT-TRIANGLE, UP-TRIANGLE, DOWN-TRIANGLE and
RIGHT-TRIANGLE, for triangles with a corner pointing to
the left, up, down and to the right respectively.
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Note that the appearance is determined by 2 distinct representations:
the fill-area item ERROR-BAR and the polyline item ERROR-BAR. By
selecting a fill area interior style of hollow, one gets "empty"
markers, while solid gives "filled" markers of a chosen colour.
More error bar types can be added on request.
The radius of the circle (type CIRCLE), the half-size of the cross
and the box (types CROSS and SQUARE), the distance from the centre
to the tips of the STARs, TRIANGLEs and HEXAGON. The size is also
used for the "serifs" at the end of the + sign that indicates the
error bars for all types with the exception of ELLIPSE.
The size is measured in the Normalised Device Coordinates, i.e. the
coordinate system in which the plot has a range of (0,0) to (1,1).
Keyword index.
Formatted on 10/11/98.