Full Command and Function Reference 3-69
Normally, the stack display is updated as soon as the calculator is ready for data input. For
example, when HALT stops a running program, or when a program ends, any displayed
messages are cleared. The FREEZE command “freezes” a part or all of the display so that it is
not updated until a key is pressed. This allows, for example, a prompting message to persist after
a program halts to await data input.
n
display area
is the sum of the value codes for the areas to be frozen:
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
→
See also: CLLCD, DISP, HALT
FROOTS
CAS: For a rational polynomial, return its roots and poles, with their corresponding multiplicities.
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 LLFS? ( °is the left-shift of the Nkey).
!°
LMODES FLAG FS? ( °is the left-shift of the Nkey).
!& H FLAG FS?
Input/Output:
Level 1/Argument 1 Level 1/Item 1
n
flag number
→
0/1
See also: CF, FC?, FC?C, FS?C, SF
FS?C
Type: Command
Description: Flag Set? Clear 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. After
testing, clears the flag.
Access: !°
TEST LLFS?C ( °is the left-shift of the Nkey).
!°
LMODES FLAG FS?C ( °is the left-shift of the Nkey).
!& H FLAG FS?C
Input/Output:
Level 1/Argument 1 Level 1/Item 1
n
flag number
→
0/1
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