HP 33s Scientific manual Equation Functions, Σxy

Equation Functions

The following table lists the functions that are valid in equations. Appendix G, "Operation Index" also gives this information.

LN	LOG	EXP	ALOG	SQ	SQRT
INV	IP	FP	RND	ABS	x!
SGN	INTG	IDIV	RMDR
SIN	COS	TAN	ASIN	ACOS	ATAN
SINH	COSH	TANH	ASINH	ACOSH	ATANH
€	€	€	€	%CHG	XROOT
DEG	RAD	HR	HMS
CB	CBRT	Cn,r	Pn,r	€	€
€	€	€	€
KG	LB	°C	°F	CM		IN
€	€	RANDOM	π
L	GAL
+	–	⋅	⎟	^
sx	sy	σ x	σ y	x	y
x w	xˆ	ˆ	r	m	b
		y
n	Σx	Σy	Σx2	Σy2	Σxy

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For convenience, prefix–type functions, which require one or two arguments, display a left parenthesis when you enter them.

The prefix functions that require two arguments are %CHG, RND, XROOT, IDIV, RMDR, Cn,r and Pn,r. Separate the two arguments with a colon.

In an equation, the XROOT function takes its arguments in the opposite order from RPN usage. For example, –8 ‘3 to is equivalent to %!1(.2.

All other two–argument functions take their arguments in the Y, X order used for RPN. For example, 28 ‘4 {\is equivalent to Q8T1(2.

For two–argument functions, be careful if the second argument is negative. For a number or variable, use ^or …. These are valid equations:

Entering and Evaluating Equations 6–15