Inverting Matrix by Row Transformation for HP 35s/33s?



#9

Since these calculators can't handle matrices, has there been any programs written to speed up the process? Perhaps a program that will transform a row when entered intered into the calculator? Thanks


#10

If you can do it by hand, you can write a program to do it. Simple as tthat--make the computer remember the steps, that's all.


#11

Thanks for the "obvious" answer. Just wondered if it had been done before. Perhaps I should have asked if there is other known software archives besides the big ones like on this website.


#12

Did you find any for the 33s? It would work on this calculator too.


#13

Anything for the 33s would be quite limited given the memory constraints of that model.

I think it is only a matter of time until someone completes a matrix determinant and inverse routine using the indirect registers on the 35s.

As previously mentioned, Datafile has an article with many matrix utilties already published. Just need a shell program written around them to call the routines and do a bit of other math.


#14

Wouldnt be too hard to write a program that would handle a 2x2 or 3x3... my programing knowledge is not good enough yet to handle something bigger. I think youd be limited anyway because of the storage capacity of variables.


#15

Storage capacity shouldn't be a problem on the 35s.

With 801 indirect registers, you can store quite a bit of information.

I remember the old TI-59 LED calculator could do an 9x9 determinant and the HP41c could do a 14x14 (if I remember correctly).

I think the 35s could do those of that size once the program is done. Now WHY you'd want to do one that big is another question. :-0


#16

(Super)String Theory.

Why anyone would want to stick with that is another question. :-0


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