HP 39gs User Manual page 42

2-2
–
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(θ). The
only independent
variable in the
expression is θ.
–
For a Sequence
definition, either
enter the first term,
or the first and
second terms, for U
(U1, or...U9, or
U0). Then define
the nth term of the sequence in terms of N or of
the prior terms, U(N–1) and/or U(N–2). The
expressions should produce real-valued
sequences with integer domains. Or define the
nth term as a non-recursive expression in terms of
n only. In this case, the calculator inserts the first
two terms based on the expression that you
define.
–
Note: You will have to enter the second term if
the hp39gs is unable to calculate it automatically.
Typically if Ux(N) depends on Ux(N–2) then you
must enter Ux(2).
Aplets and their views