Syntax: ELLIPSE\XYOUT a b xc yc angle xout yout
ELLIPSE\FIT\XYOUT xin yin xout yout
By default, the ellipse perimeter will be plotted automatically. It is
assumed that a graph has been drawn already. The ellipse will be overlayed
on this graph, with no plotting symbol. If the \XYOUT qualifier is used,
then two output vector names, xout and yout, are expected. No automatic
plotting is done, and the horizontal and vertical coordinates of the
uniformly populated ellipse perimeter will be placed in these two vectors.
The REPLOT command will replot any curves that have been drawn as well as the automatically drawn ellipse, all on a common scale large enough to accommodate all curves. If the \NOREPLOT qualifier is used, the automatically drawn ellipse will not be stored in the replot buffers.
Syntax: ELLIPSE\NPTS a b xc yc angle n
ELLIPSE\FIT\NPTS xin yin n
Defaults: n = 260, \-NPTS
By default, the ellipse perimeter is populated by 260 points. If the \NPTS
qualifier is used, the number of points with which to populate the perimeter
is expected. This number should be divisible by 4.
Syntax: ELLIPSE a b xc yc angle
Qualifiers: \NPTS, \XYOUT, \REPLOT
Defaults: \-NPTS, \-XYOUT, \REPLOT
Examples: ELLIPSE\NOREPLOT MAJOR MINOR XCENT YCENT ANG
ELLIPSE\XYOUT\NPTS MAJOR MINOR XC YC ANG N XOUT YOUT
By default, the input parameters are assumed to be scalars representing
the major axis radius, a, the minor axis radius, b, the coordinates of
the centre, cx and cy, and the angle of the ellipse, angle (with respect
to the horizontal, measured counter-clockwise, in degrees).
Additional Information on:
Syntax: ELLIPSE\FIT xin yin
ELLIPSE\FIT\FRACTION xin yin frac
ELLIPSE\FIT\PARAMETERS xin yin a b cx cy angle
Qualifiers: \NPTS, \XYOUT, \FRACTION, \PARAMETERS, \MESSAGES, \REPLOT
Defaults: \-NPTS, \-XYOUT, \-FRACTION, \-PARAMETERS, \MESSAGES, \REPLOT
frac = 0.9
Examples: ELLIPSE\FIT\FRAC\NPTS XIN YIN FRAC N
ELLIPSE\FIT\XYOUT\NPTS XIN YIN N XO YO
ELLIPSE\FIT\XYOUT\FRAC XIN YIN FRAC XO YO
ELLIPSE\FIT\XYOUT\FRAC\NPTS XIN YIN FRAC N XO YO
ELLIPSE\FIT\PARAM\FRAC\NPTS XIN YIN FRAC A B CX CY ANG N
ELLIPSE\FIT\PARAM\XYOUT\FRAC\NPTS X Y F A B CX CY ANG N XO YO
If the \FIT qualifier is used, then the first two parameters, xin and
yin, are assumed to be vectors which contain data points to which an
ellipse is to be fitted.
Additional Information on: