HP 38g Graphing Calculator - Manual (Page 67)

To define the 1. Display the Symbolic view (| symb |). If the highlight is on
expression an existing expression, scroll to an empty line—unless you
don’t mind writing over the expression. Or, clear one line
(I DEL I) or all lines (■ [CLEAR]).
2. Make sure your function is in the form “y = For example,
given the equation 9x+y - 11=0, you would rearrange it
to y =
f(x) = -9x + 11. Type in just the expression
(-9x+l 1) for the right side.
• For a Function definition, enter an expression to
define F(X). The only independent variable in the
expression is X.
» For a Parametric definition, enter a pair of
expressions to define X(T) and Y(T). The only
independent variable in the expressions is T.
® For a Polar definition, enter an expression to define
R(0). The only independent variable in the expression
is 0 .
e For a Sequence definition, enter the first, second, and
nth terms for U (U1, or...U9, or UO). Define a sequence
function in terms of N or of the prior terms, U(N -1)
and U(N -2). The expressions should produce real­
valued sequences with integer domains.
3. Press I ENTER I or {{OK}} to enter the expression into the list.
All checkmarked expressions mill be plotted.
Plotting and Exploring Functions 3-3