Reference Guide

3-92 Full Command and Function Reference
Display Area Value Code
Status area 1
History/Stack/Command-line area 2
Menu area 4
So, for example, 2 FREEZE freezes the history/stack/command-line area, 3 FREEZE freezes
the status area and the history/stack/command-line area, and 7 FREEZE freezes all three areas.
Values of n
display area
≥ 7 or ≤ 0 freeze the entire display (are equivalent to value 7). To freeze the
graphics display, you must freeze the status and stack/command-line areas (by entering 3), or the
entire display (by entering 7).
Access: !°L OUT FREEZE ( °is the left-shift of the Nkey).
Input/Output:
Level 1/Argument 1 Level 1/Item 1
n
displayarea
→
Example 1: This program:
« "Ready for data" 1 DISP 1 FREEZE HALT »
displays the contents of the string in the top line of the display, then freezes the status area so that
the string contents persist in the display after HALT is executed.
Example 2: This program:
« { # 0d # 0d } PVIEW 7 FREEZE »
selects the graphics display and then freezes the entire display so that the graphics display persists
after the program ends. (If FREEZE was not executed, the stack display would be selected after
the program ends.) To use FREEZE with PVIEW (or any graphics display), you must enter 3 or
7.
Flags: None
See also: CLLCD, DISP, HALT
FROOTS
Type: Command
Description: For a rational polynomial, returns an array of its roots and poles, with their corresponding
multiplicities. This is the inverse of FCOEF and uses the same notation for roots and poles.
Access: Arithmetic, !Þ POLY L
Input: A rational polynomial.
Output: An array of the form [Root 1, Multiplicity 1, Root 2, Multiplicity 2, . . .]
A negative multiplicity indicates a pole.
Flags: Exact mode must be set (flag –105 clear). Numeric mode must not be set (flag –3 clear).
Radians mode must be set (flag –17 set).
If complex mode is set (flag –103 set), FROOTS looks for complex solutions as well as real
solutions.
If approximate mode is set (flag –105 set) FROOTS searches for numeric roots.
See also: FCOEF
FS?
Type: Command
Description: Flag Set? Command: Tests whether the system or user flag specified by n
flag number
is set, and
returns a corresponding test result: 1 (true) if the flag is set or 0 (false) if the flag is clear.
Access: !° TEST LL FS ? ( °is the left-shift of the Nkey).