HP15C using integration in a program

05062022, 06:58 AM
(This post was last modified: 05062022 12:19 PM by edwinst.)
Post: #1




HP15C using integration in a program
Dear forum members!
[UPDATE: Sorry, it was a stupid pilot error. The calculator stores the program instruction only after the label of the function to be integrated has been keyed in. For some reason I expected the command to show up immediately but of course it does not, consistent with other commands using a label.] The HP15C manual states that numerical integration can be used as an instruction in a program. (p. 203 for the HP15C LE Owner's Handbook, "Using [INTEGRATE] in a Program"). However, when I try to key in INTEGRATE in program mode, my calculators just ignore it. I tried it on an original HP15C and on the HP15C LE with the same result. Does anyone know whether using integration from a program is actually possible, and if so, how? best regards Edwin 

05072022, 06:58 AM
Post: #2




RE: HP15C using integration in a program
Hi Edwin,
its not complicated and can best explained by a small example. Assume you want to write a program that integrates the function y=x^2. Lower limit is in the y register, upper limit in the x register. Your main program is LBL A. And you need a second program with the function to integrate. Assume this is LBL B. LBL A // 001  42,21,11 f (S) B // 002  42,20,12 (S) stands for Integral sign above the multiplication key g RTN // 003  43 32 LBL B // 004  42,21,12 g x² // 005  43 11 g RTN // 006  43 32 Example: To get the integral from 0 to 2 of y=x²: 0 ENTER 2 fA > 2,667 which is correct 

05072022, 07:27 AM
Post: #3




RE: HP15C using integration in a program
Hi rawi,
(05072022 06:58 AM)rawi Wrote: its not complicated and can best explained by a small example. Thanks for the nice example! Yes, it works fine and I was just being dumb and did not realize that the integrate command would only show up after I had keyed in the label of the function to integrate. I have since updated my post to that effect. best regards Edwin 

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