Reference Guide

3-190 Full Command and Function Reference
QXA
Type: Command
Description: Expresses a quadratic form in matrix form.
Access: !Ø QUADF , !Ú MATRX
Input: Level 2/Argument 1: A quadratic form.
Level 1/Argument 2: A vector containing the variables.
Output: Level 2/Item 1: The quadratic form expressed in matrix form.
Level 1/Item 2: The vector containing the variables.
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: Express the following quadratic form in matrix form:
x
2
xy y
2
+ +
Command: QXA(X^2+X*Y+Y^2, [X,Y])
Result: {[[1,1/2][1/2,1]],[X,Y]}
See also: AXQ, GAUSS, SYLVESTER
RAD
Type: Command
Description: Radians Mode Command: Sets Radians angle mode.
RAD sets flag –17 and clears flag –18, and displays the RAD annunciator.
In Radians angle mode, real-number arguments that represent angles are interpreted as radians,
and real-number results that represent angles are expressed in radians.
Access: „& H ANGLE RAD
„°L MODES ANGLE RAD ( °is the left-shift of the Nkey).
Input/Output: None
See also: DEG, GRAD
RAND
Type: Command
Description: Random Number Command: Returns a pseudo-random number generated using a seed value,
and updates the seed value.
The calculator uses a linear congruential method and a seed value to generate a random number
x
random
in the range 0 ≤ x < 1. Each succeeding execution of RAND returns a value computed
from a seed value based upon the previous RAND value. (Use RDZ to change the seed.)
Access: !´L PROBABILITY RAND ( ´ is the left-shift of the Pkey).
Input/Output:
Level 1/Argument 1 Level 1/Item 1
→
x
random
See also: COMB, PERM RDZ, !
RANK
Type: Command
Description: Matrix Rank Command: Returns the rank of a rectangular matrix.