HP 39gII User Manual page 68

58
The FCN functions are:
Function
Root
Extremum
Slope
Signed
area
Intersection
Description
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
Extremum: instead of Root:. The
cursor is moved to the root value on
the x-axis and the resulting x-value is
saved in a variable named Root.
Select Extremum to find the
maximum or minimum of the current
function nearest the cursor. The cursor
moves to the extremum and the
coordinate values are displayed.The
resulting value is saved in a variable
named Extremum.
Select Slope to find the numeric
derivative of the current function at
the current position of the cursor. The
result is saved in a variable named
Slope.
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 select
an ending point. The result is saved in
a variable named SignedArea.
Select Intersection to find the
intersection of the graph you are
currently tracing and another graph.
You need to have at least two
selected expressions in the Symbolic
view. Finds the intersection closest to
the tracer coordinates. Displays the
coordinate values and moves the
cursor to the intersection. The
resulting x-value is saved in a
variable named Isect.
Function app