Reference Guide

3-224 Full Command and Function Reference
Access: !´ REAL L SIGN ( ´ is the left-shift of the Pkey).
…ßL SIGN ( ß is the right-shift of the 1key).
Flags: Numerical Results (–3)
Input/Output:
Level 1/Argument 1 Level 1/Item 1
z
1
→
z
2
x_unit
→
x
sign
'symb'
→
'SIGN(symb)'
Example 1: 32_ft SIGN returns 1 .
Example 2: (1,1) SIGN returns (.707106781187,.707106781187) .
See also: ABS, MANT, XPON
SIGNTAB
Type: Command
Description: Tabulates the sign of a rational function of the current CAS variable.
Access: P GRAPH , !Ö GRAPH
Input: An algebraic expression.
Output: A list containing, the points where the expression changes sign, and between each pair of points,
the sign of the expression between those points.
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).
Example: Show the ranges of values of x for which the expression 2-x
2
is positive and negative.
Command: SIGNTAB(2 – X^2)
Result: { ' -∞ ' – '-√2' + '√2' – '+ ∞ ' }
See also: TABVAR
SIMP2
Type: Command
Description: Simplifies two objects by dividing them by their greatest common divisor.
Access: Arithmetic, !Þ L
Input: Level 2/Argument 1: The first object.
Level 1/Argument 2: The second object.
Output: Level 2/Item 1: The first object divided by the greatest common divisor.
Level 1/Item 2: The second object divided by the greatest common divisor.
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).
Example: Divide the following expressions by their greatest common divisor:
x
3
6x
2
11x 6+ + +
x
3
7x– 6–
Command: SIMP2(X^3+6*X^2+11*X+6, X^3-7*X-6)
Result: {X+3,X-3}