HP Forum Archive 17

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Inverting Matrix by Row Transformation for HP 35s/33s? Message #1 Posted by Howard Boardman on 3 Aug 2007, 12:39 p.m. 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

Re: Inverting Matrix by Row Transformation for HP 35s/33s? Message #2 Posted by bill platt on 3 Aug 2007, 1:51 p.m., in response to message #1 by Howard Boardman 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.

Re: Inverting Matrix by Row Transformation for HP 35s/33s? Message #3 Posted by Howard Boardman on 3 Aug 2007, 3:33 p.m., in response to message #2 by bill platt 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.

Re: Inverting Matrix by Row Transformation for HP 35s/33s? Message #4 Posted by bill platt on 3 Aug 2007, 4:03 p.m., in response to message #3 by Howard Boardman Did you find any for the 33s? It would work on this calculator too.

Re: Inverting Matrix by Row Transformation for HP 35s/33s? Message #5 Posted by Gene Wright on 3 Aug 2007, 4:35 p.m., in response to message #4 by bill platt 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.

Re: Inverting Matrix by Row Transformation for HP 35s/33s? Message #6 Posted by Howard Boardman on 4 Aug 2007, 11:10 a.m., in response to message #5 by Gene Wright 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.

Re: Inverting Matrix by Row Transformation for HP 35s/33s? Message #7 Posted by Gene Wright on 4 Aug 2007, 11:25 a.m., in response to message #6 by Howard Boardman 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

Re: Inverting Matrix by Row Transformation for HP 35s/33s? Message #8 Posted by Ed Look on 4 Aug 2007, 8:10 p.m., in response to message #7 by Gene Wright (Super)String Theory. Why anyone would want to stick with that is another question. :-0

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