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3-10 Function aplet

FCN functions The FCN functions are:

Function Description

Root Select Root to find the root of the

current function nearest the

cursor. If no root is found, but only

an extremum, then the result is

labeled EXTR: instead of ROOT:.

(The root-finder is also used in the

Solve aplet. See also “Interpreting

results” on page 7-6.) The cursor

is moved to the root value on the

x-axis and the resulting x-value is

saved in a variable named

ROOT.

Extremum Select Extremum to find the

maximum or minimum of the

current function nearest the

cursor. This displays the

coordinate values and moves the

cursor to the extremum. The

resulting value is saved in a

variable named EXTREMUM.

Slope Select Slope to find the numeric

derivative at the current position

of the cursor. The result is saved in

a variable named SLOPE.

Signed area Select Signed area to find the

numeric integral. (If there are two

or more expressions

checkmarked, then you will be

asked to choose the second

expression from a list that

includes the x-axis.) Select a

starting point, then move the

cursor to selection ending point.

The result is saved in a variable

named AREA.

hp40g+.book Page 10 Friday, December 9, 2005 12:27 AM

HP 40gs User Manual

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