Question about HP-15C Integrals

[Namir]

Does the HP-15C support multiple integrals?

Namir

[Namir]

I used a simulator to test multiple integrals and the answer is NO!

Namir

[brouhaha]

The 34C and 15C can use solve together with integrate, but unfortunately you can't use nested solves or nested integrations. This is largely because these calculators have one one set of internal solve variables and one set of internal integration variables. In the 34C those are in dedicated internal memory, while in the 15C the necessary space is allocated from the "pool".

Of HP caluclators, AFAIK only the RPL models (28, 48, 49, 50) can do nested solve or nested integration.

The 71B Math module can do nested solve and integrate as well, to a depth of five, but I don't generally consider the 71B as a calculator.

[Valentin Albillo]

(05-31-2023 08:42 PM)Namir Wrote:  Does the HP-15C support multiple integrals?

Not out of the box but this program o'mine computes double integrals and runs both on the HP-34C and on the HP-15C except that 50 DSE must be changed to 50 DSE I.

Regards.
V.

[Ángel Martin]

FWIW there's a recursive implementation of SOLVE and INTEG for the HP-41 that is capable of dealing with double integrals and with 2-variable function root finding. They are available on TOS and here: https://www.systemyde.com/pdf/Advantage_Math_Manual.pdf

[jonmoore]

(06-01-2023 06:29 AM)Ángel Martin Wrote:  FWIW there's a recursive implementation of SOLVE and INTEG for the HP-41 that is capable of dealing with double integrals and with 2-variable function root finding. They are available on TOS and here: https://www.systemyde.com/pdf/Advantage_Math_Manual.pdf

I can highly recommend Ángel's excellent routines in his Advantage Math ROM. I use this ROM on the DM41X regularly.

It's important to know that you also have to have Ángel's equally excellent SandMath, 41Z (complex math) and SandMatrix ROMs installed on your 41 device of choice, but both Systemyde's custom 41 hardware extension of the original 41, and the DM41X make it easy to reconfigure your 41 ROM's on the device itself.

Ángel's ROMs make up a clean sweep of my DM41X ROM map slots, and I swap out his HP16 emulation ROM for the Advantage Math ROM, when I want to dabble with his excellent extensions to SandMath, 41Z and SandMatrix.