NEW: HP 15C Collectors Edition

[Valentin Albillo]

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Hi, José,

(08-03-2023 06:24 PM)Divasson Wrote:  The original firmware only guarantees inverting matrix of up to 8x8. Therefore we need a method to invert up to 13x13. Valentiiiiiiiiiiiín ! We need you !

I'll post tomorrow or the day after that (i.e. Saturday Aug, 5th) a couple of HP-15C programs I've written which can be used to compute the matrix inverse and the determinant of an NxN matrix (2 ≤ N ≤ 16 depending on available RAM,) which will run on any HP-15C version, including the original, the LE (patched for extra RAM or not), the CE (with 96 regs or more), the DM15's various versions and firmwares, as well as various true emulators (patched for extra RAM or not).

It runs quite fast, e.g. using the CE/96 regs it computes the inverse of a 9x9 matrix in 0.8 sec., and the determinant in ~ 0.2 sec.

I'm just completing the docs, including several worked examples, so stay tuned.

Best regards.
V.
P.S.: I wrote NxN Matrix Inversion programs in the distant past, e.g. have a look at this one for the HP-41C.