HP 32SII Owner's Manual page 218

2. Include an INPUT instruction for each variable, including the unknown.
INPUT instructions enable you to solve for any variable in a multi–variable
function. INPUT for the unknown is ignored by the calculator, so you need
to write only one program that contains a separate INPUT instruction for
every variable (including the unknown).
If you include no INPUT instructions, the program uses the values stored in
the variables or entered at equation prompts.
3. Enter the instructions to evaluate the function.
A function programmed as a multi–line RPN sequence must be in the
form of an expression that goes to zero at the solution. If your equation
is f(x) = g(x), your program should calculate f(x) – g(x). "=0" is
implied.
A function programmed as an equation can be any type of
equation—equality, assignment, or expression. The equation is
evaluated by the program, and its value goes to zero at the solution. If
you want the equation to prompt for variable values instead of
including INPUT instructions, make sure flag 11 is set.
4. End the program with a RTN. Program execution should end with the value
of the function in the X–register.
SOLVE works only with real numbers. However, if you have a complex–valued
function that can be written to isolate its real and imaginary parts, SOLVE can
solve for the parts separately.
Example: Program Using RPN.
Write a program using RPN operations that solves for any unknown in the
equation for the "Ideal Gas Law." The equation is:
where
P = Pressure (atmospheres or N/m
V = Volume (liters).
N = Number of moles of gas.
14–2 Solving and Integrating Programs
File name 32sii-Manual-E-0424
Printed Date : 2003/4/24
P x V= N x R x T
2
).
Size : 17 .7 x 25.2 cm