Reference Guide

3-284 Full Command and Function Reference
YVOL
Type: Command
Description: Y Volume Coordinates Command: Sets the depth of the view volume in the reserved variable
VPAR.
The variables y
near
and y
far
are real numbers that set the y-coordinates for the view volume used in
3D plots. y
near
must be less than y
far
. These values are stored in the reserved variable VPAR.
Access: …µ YVOL
Input/Output:
Level 2/Argument 1 Level 1/Argument 2 Level 1/Item 1
y
near
y
far
→
See also: EYEPT, XVOL, XXRNG, YYRNG, ZVOL
YYRNG
Type: Command
Description: Y Range of an Input Plane (Domain) Command: Specifies the y range of an input plane (domain)
for GRIDMAP and PARSURFACE plots.
The variables y
y near
and y
y far
are real numbers that set the y-coordinates for the input plane. These
values are stored in the reserved variable VPAR.
Access: …µ YYRNG
Input/Output:
Level 2/Argument 1 Level 1/Argument 2 Level 1/Item 1
y
near
y
far
→
See also: EYEPT, XVOL, XXRNG, YVOL, ZVOL
ZEROS
Type: Command
Description: Returns the zeros of a function of one variable, without multiplicity.
Access: P SOLVE , Symbolic solve, !ÎL
Input: Level 2/Argument 1: An expression.
Level 1/Argument 2: The variable to solve for.
Output: The solution, or a list of solutions, for the expression equated to 0.
Flags: Radians mode must be set (flag –17 set).
For a symbolic result, clear the CAS modes Numeric option (flag –3 clear).
The following flag settings affect the result:
• If Exact mode is set (flag –105 is clear), attempts to find exact solutions only. This may return a
null list, even if approximate solutions exist.
• If Approximate mode is set (flag –105 set), finds numeric roots.
• If Complex mode is set (flag –103 set), searches for real and complex roots.
Example: Find the roots of the following equation in x, without specifying that x=2 is a root twice.
x
3
– x
2
– 8x + 12 = 0:
Command: ZEROS(X^3-X^2-8*X+12)
Results: {-3, 2}