HP 40G manual Access FCN variables FCN functions, Function Description

Access FCN variables

FCN functions

The FCN variables are contained in the VARS menu.

To access FCN variables in HOME:

>9$56@ $3/(7a

Select Plot FCN

*A,￿

*k,or *e, to choose a variable 2.a

To access FCN variable in the Function aplet’s Symbolic view:

>9$56@

Select Plot FCN

*A,￿

*k,2.aor *e, to choose a variable

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.

Function aplet 3-9