HP HP-18C User Manual

QUAN:200.000000000
QUAN:100.000000000
+
G!UAN= 127.37
Solves for QUAN
numerically.
Writing Formulas That the Solver
Understands
Sometimes a formula printed in a book or written out longhand will
have to be adapted before it can be typed into the formula list. For
example, examine
the following formula for calculating the annual
yield on T -bills*, printed as it might appear in a book:
$
'c.::
1
:..::
O
-,-, O::..;O:..:°O----'Pc:..:r:..:.ic.=..:e:.... X
Annual yield = -
360 days
price
days to maturity
The formula requires several changes before the solver can under-
stand it.
In discussing formulas, it helps to define several terms:
• User-variables are the named items-for example, Annual yield,
price,
and days to maturity.
• Constants are numbers-for example, $10,000, 360 days.
• Operators perform arithmetic-for example, x, and -.
• Functions do calculations involving one or two numbers-for exam-
ple, SQRT(x), USPV(i%:n).
Functions are described in the next
section.
* The price in this formula is in terms of full units of $10,000.
9: The Formula Solver 141

HP HP-18C Specifications

General

Brand	HP
Model	HP-18C
Category	PDA
Language	English