HP 48gII Graphing, 50g Graphing QXA, RAD, RAND, RANK

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:
	x2 + xy + y2
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	Command
Type:
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:	„& HANGLE RAD
	„°LMODES ANGLE RAD		( °is the left-shift of the Nkey).
Input/Output:	None
See also:	DEG, GRAD
RAND	Command
Type:
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
	xrandom 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:	!´LPROBABILITY RAND		( ´is the left-shift of the Pkey).
Input/Output:
		Level 1/Argument 1		Level 1/Item 1
			→	xrandom
See also:	COMB, PERM RDZ, !
RANK	Command
Type:
Description:	Matrix Rank Command: Returns the rank of a rectangular matrix.

3-190 Full Command and Function Reference