HP 35s Scientific Calculator - Manual (Page 241)

Solving and Integrating Programs 15-7
Integrating a Program
In chapter 8 you saw how you can enter an equation (or expression) — it's added
to the list of equations — and then integrate it with respect to any variable. You can
also enter a program that calculates a function, and then integrate it with respect to
any variable. This is especially useful if the function you're integrating changes for
certain conditions or if it requires repeated calculations.
To integrate a programmed function:
1. Enter a program that defines the integrand's function. (See "To write a program
for ∫ FN" below.)
Program Lines:
(In RPN mode)
Description:
   Setup for X.
  Index for X.
   Branches to main routine.
Checksum and length: 62A0 11
  
Setup for Y.
  Index for Y.
   Branches to main routine.
Checksum and length: 221E 11
  
Main routine.
   Stores index in I
   Defines program to solve.
  Solves for appropriate variable.
  Displays solution.
  Ends program.
Checksum and length: D45B 18
  



Calculates f (x,y). Include INPUT or equation
prompting as required.
 