D - 10 Reserved Variables
Parameter (Command) Description Default Value
(xleft, xright) (XVOL)
Real numbers that specify the width of the view volume.
(
–1, 1 )
(yfar, ynear) (YVOL)
Real numbers that specify the depth of the view volume.
(
–1, 1 )
( zlow, zhigh ) (ZVOL )
Real numbers that specify the height of the view volume.
(
–1, 1 )
(xeye, yeye, zeye) (EYEPT )
Real numbers that specify the point in space from which
the plot is viewed.
(0,
–3, 0 )
(xstep, ystep)
(NUMX, NUMY)
Real numbers that specify the increments between of x-
coordinates and y-coordinates plotted. The increments are
equal to the range for the axes divided by the number of
steps. Used instead of (or in combination with) res.
(10, 8 )
(xxleft, xxright) (XXRNG)
Real numbers that specify the width of the input plane
( domain ). Used by GRIDMAP and PARSURFACE.
(
–1, 1 )
(yyfar, yynear) (YYRNG)
Real numbers that specify the depth of the input plane
( domain ). Used by GRIDMAP and PARSURFACE.
(
–1, 1 )
Parameters without commands can be modified programmatically by storing new values in the list contained in
VPAR ( use the PUT command ).
ZPAR
ZPAR is a variable in the current directory. It contains a list of zooming parameters used by the DRAW
command for all 2-D mathematical and statistical plots.
Parameter (Command) Description Default Value
h-factor
Real number that specifies the horizontal zoom factor. 4
v-factor
Real number that specifies the vertical zoom factor. 4
recenter flag
0 or 1 depending on whether the recenter at crosshairs
option was selected in the set zoom factors input form.
0
{ list } An empty list, or a copy of the last PPAR.
Use the set zoom factors input form ( ZFACT ) to modify ZPAR.
ΣDAT
Σ
DAT is a variable in the current directory that contains either the current statistical matrix or the name of the
variable containing this matrix. This matrix contains the data used by the Statistics applications.
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General
Weight and Dimensions
