Apple Newton Works Graphing Calculator - Manual (Page 18)

Using the financial functions
The Financial list contains the following functions:
Function Abbreviation Description
Annuity Annuity(rate,periods) Returns the present value of an annuity
(1 – (1 + r)^n)/r
Compound Compound(rate,periods) Returns (1 + r)^n
Examples
Calculate your savings after two years if you deposited $3000 at 5.25% interest,
compounded annually.
3000*compound(.0525,2) -> 3323.27
Calculate the current principal if you’ve made 12 payments of $320 at a rate of 8.5%.
320*annuity(.085,12)
Creating your own functions
You can create functions and use functions that you define. Functions must have a
function name followed by the argument names in parentheses on the left side of the
equals sign and an expression on the right.
Note: You must enter a function name for each expression.
The following are examples of valid functions:
y(x)=sin(x–0.5*pi)
z(x)=sqrt(16–x^2)
r(t)=8cos(t)
p(t)=[4cos(t),3sin(t)]
qrts(a,b,c)=[(–b+sqrt(b^2–4a*c))/(2a),(–b–sqrt(b^2–
4a*c))/(2a)]
18 Chapter 2