HP Forum Archive 14

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Programming a Matrix(hp49G+) ? Message #1 Posted by Barry on 9 June 2004, 9:18 a.m. Hi I would like to take a value from the stack place it into a matrix, and get an ouput value. I have tried << -> x '[[cos(x),sin(x)][sin(x),cos(x)]]'>> I get a "bad argument error' Normal equation work. Does anyone know how to do this? Thanks Barry

Re: Programming a Matrix(hp49G+) ? Message #2 Posted by Vieira, Luiz C. (Brazil) on 9 June 2004, 9:55 a.m., in response to message #1 by Barry Hi, Barry; I remember that till the HP48, all arguments possible in an array are numbers, even complex (not sure if bunaries are allowed as well... I think not). I don't recall having algebraics as array "arguments". anyway, you can arrange your expressions in lists and disassemble/reassemble: turn lists into arrays. If I am not wrogn, the HP49G+ has some new features for this. Also, having the expressions organized in lists, like {{cos(x) sin(x)}{sin(x) cos(x)}} allows you to use a handy command: DOLISTS (also DOSUBS may help, depending on what you want). I guess SYS RPL guys may have other possibilities. I'm starting to read about SYS RPL, and there are many interesting things there... It's a new world. Hope you succeed. If not, post again. Cheers. Luiz (Brazil)

Re: Programming a Matrix(hp49G+) ? Message #3 Posted by Vepa on 9 June 2004, 9:56 a.m., in response to message #1 by Barry << -> x '[[cos(x),sin(x)][sin(x),cos(x)]]'>> I get a "bad argument error' Normal equation work. You need an ALGebraic side trick: << -> x << `[[COS(x),SIN(x)] [SIN(x),COS(x)]]` >> >> BYTES # 917Bh 92.5 `[V,P,N]`

Re: Programming a Matrix(hp49G+) ? Message #4 Posted by Veli-Pekka Nousiainen on 9 June 2004, 10:03 a.m., in response to message #3 by Vepa You could also use a pure RPN program: << -> x << [[ 'COS(X)' 'SIN(X)' ] [ 'SIN(X)' 'COS(X)' ]] 'X' x = SUBST ->NUM >> >> BYTES # D351h 109.5 You may leave the ->NUM away if you want to do it manually. [V P N]

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