HP 50g Graphing, 48gII Graphing manual 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, realnumber arguments that represent angles are interpreted as radians,
	and realnumber results that represent angles are e xpressed in radians.
Access:	„& HANGLE RAD
	„°LMODES ANGLE RAD		( °is the leftshift of the	Nkey).
Input/Output:	None
See also:	DEG, GRAD
RAND	Command
Type:
Description:	Random Number Command: Returns a pseudorandom num ber 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 leftshift 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.

3190 Full Command and Function Reference