
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,X
2
-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(X)
2
-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 Xvalue 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.
386 Chapter 22 Functions and commands
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