CALL: PLOT_ERROR_BAR


center

  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.

errors

  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.

type

  The following error bar types are currently available:

  -------------------------------------------------------------------
  Type      Description
  -------------------------------------------------------------------
  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.
  -------------------------------------------------------------------

  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.

size

  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.