HP 48gII Graphing, 50g Graphing manual Apply, Arc, Access …µAPPLY Input/Output

characters), as might have been left on the stack by entries when running in algebraic mode, will be ignored.

Access:	!Î		( Îis the leftshift of the	`key).
Input/Output:
		Level 1/Argument 1		Level 1/Item 1
		n	→	objn
See also:	LAST, LASTARG, PICK
APPLY	Function
Type:
Description:	Apply to Arguments Function: Creates an expression from the specified function name and
	arguments.

A userdefined function f that checks its arguments for special cases often can’t determine whether a symbolic argument x represents one of the special cases. The function f can use APPLY to create a new expression f(x). If the user now evaluates f(x), x is evaluated before f, so the argument to f will be the result obtained by evaluating x.

When evaluated in an algebraic expression, APPLY evaluates the arguments (to resolve local names in userdefined functions) before creating th e new object.

Access: …µAPPLY

Input/Output:

Level 2/Argument 1 Level 1/Argument 2Level 1/Item 1

	1		n	}	'name'	→	1	n
		{ symb	... symb				'name(symb	... symb )'
	The following
Example:		userdefined function Asin is a variant of the builtin function ASIN.						Asin checks for
	special numerical arguments. If the argument on the stack is symbolic (the second case in the case
	structure), Asin uses APPLY to return the expression 'Asin(argument)'.
	« → argument « CASE 3 FS? THEN argument ASIN END
	{ 6 7 9 } argument TYPE POS THEN
	'APPLY(Asin,argument)' EVAL END
	'argument==1' THEN 'π/2' END
	'argument==1' THEN 'π/2' END
	argument ASIN
	END » »
	`OAsinK
See also:	QUOTE,
ARC	Command
Type:

Description: Draw Arc Command: Draws an arc in PICT counterclockwise from xθ1 to xθ2, with its center at the coordinate specified in argument 1 or level 4 and its radius specified in argument 2 or level 3.

ARC always draws an arc of constant radius in pixels, even when the radius and center are specified in userunits, regardless of the relative scales in userunits of the x and yaxes. With userunit arguments, the arc starts at the pixel sp ecified by (x, y) + (a, b), where (a, b) is the rectangular conversion of the polar coordinate (xradius, xθ1). The resultant distance in pixels from the starting point to the center pixel is used as the actual radius, r'. The arc stops at the pixel specified by (r', xθ2).

If xθ1 = xθ2, ARC plots one point. If xθ1 – xθ2 >360 degrees, 2π radians, or 400 grads, ARC draws a complete circle.

Full Command and Function Reference 313