Reference Guide

Full Command and Function Reference 3-85
Access: …µ FAST 3 D
Input/Output: None
See also: BAR, CONIC, DIFFEQ, FUNCTION, GRIDMAP, HISTOGRAM, PARAMETRIC,
PARSURFACE, PCONTOUR, POLAR, SCATTER, SLOPEFIELD, TRUTH, WIREFRAME,
YSLICE
FCOEF
Type: Command
Description: From an array of roots and multiplicities/poles, returns a rational polynomial with a leading
coefficient of 1, with the specified set of roots or poles, and with the specified multiplicities.
Access: Arithmetic, !Þ POLY L
Input: An array of the form [Root 1, multiplicity/pole 1, Root 2, multiplicity/pole 2, . . .] The
multiplicity/pole must be an integer. A positive number signifies a multiplicity. A negative
number signifies a pole.
Output: The rational polynomial with the specified roots and multiplicities/poles. The polynomial is
written using the current independent variable.
Flags: Exact mode must be set (flag –105 clear).
Numeric mode must not be set (flag –3 clear).
Example: Find the rational polynomial corresponding to the following set of roots and poles:
1, 2, 3, –1
Command: FCOEF([1,2,3,-1])
Result: (X-1)^2/(X-3)
See also: FROOTS
FC?
Type: Command
Description: Flag Clear? Command: Tests whether the system or user flag specified by n
flag number
is clear, and
returns a corresponding test result: 1 (true) if the flag is clear or 0 (false) if the flag is set.
Access: !° TEST LL FC ? ( °is the left-shift of the Nkey).
!° L MODES FLAG FC ? ( °is the left-shift of the Nkey).
!&H FLAG FC ?
Input/Output:
Level 1/Argument 1 Level 1/Item 1
n
flag number
→
0/1
See also: CF, FC?C, FS? FS?C, SF
FC?C
Type: Command
Description: Flag Clear? Clear Command: Tests whether the system or user flag specified by n
flag number
is clear,
and returns a corresponding test result: 1 (true) if the flag is clear or 0 (false) if the flag is set. After
testing, clears the flag.
Access: !° TEST LL FC ? C ( °is the left-shift of the Nkey).
!° L MODES FLAG FC ? C ( °is the left-shift of the Nkey).
!&H FLAG FC ? C