Access:

!´REAL LSIGN

( ´is the left-shift of the Pkey).

 

…ßLSIGN

( ßis the right-shift of the 1key).

Flags:

Numerical Results (–3)

 

 

Input/Output:

 

 

 

 

 

 

 

 

 

 

Level 1/Argument 1

Level 1/Item 1

 

 

 

 

 

 

 

z1

→

z2

 

 

x_unit

→

xsign

 

 

'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:

PGRAPH, !ÖGRAPH

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-x2is 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, !ÞL

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:

 

x3 + 6x2 + 11x + 6

 

x3 – 7x – 6

Command:

SIMP2(X^3+6*X^2+11*X+6, X^3-7*X-6)

Result:

{X+3,X-3}

3-224 Full Command and Function Reference