HP Prime Graphing NW280AAABA manual Function app functions

Function app functions

The Function app functions provide the same functionality found in the Function app's Plot view under the FCN menu. All these operations work on functions. The functions may be expressions in X or the names of the Function app variables F0 through F9.

AREA	Area under a curve or between curves. Finds the signed area
	under a function or between two functions. Finds the area
	under the function Fn or below Fn and above the function Fm,
	from lower X-value to upper X-value.
	AREA(Fn,[Fm,]lower,upper)
	Example:
	AREA(-X,X2-2,-2,1) returns 4.5
EXTREMUM	Extremum of a function. Finds the extremum (if one exists) of
	the function Fn that is closest to the X-value guess.
	EXTREMUM(Fn, guess)
	Example:
	EXTREMUM(X2-X-2,0) returns 0.5
ISECT	Intersection of two functions. Finds the intersection (if one
	exists) of the two functions Fn and Fm that is closest to the X-
	value guess.
	ISECT(Fn,Fm,guess)
	Example:
	ISECT(X,3-X,2) returns 1.5
ROOT	Root of a function. Finds the root of the function Fn (if one
	exists) that is closest to the X-value guess.
	ROOT(Fn,guess)
	Example:
	ROOT(3-X2,2) returns 1.732…
SLOPE	Slope of a function. Returns the slope of the function Fn at the
	X-value (if the function’s derivative exists at that value).
	SLOPE(Fn,value)
	Example:
	SLOPE(3-X2,2) returns -4

348 Functions and commands