HP14/PHASOR 04c: HP-50g Matrices and Complex Numbers

By petition ... using the HP-50g/40g+ to solve a system of linear equations with complex number coefficients with matrices. Please be patient with my calling the elements of the matrix as "coefficients", as I am thinking of them as the coefficients of the original equations all the time. I strongly recommend that you watch first all the other videos in this series (this is the video #14 on HP-50g/40g+), in particular the one on matrices and vectors (real numbers) video HP06 on http://www.youtube.com/watch?v=g-pO8X8k8pg.

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[sbergman27]

I've recently rediscovered my 1993 vintage HP48GX. I added a 128k card, the alg48 lib & speedui, and have been following along with these exercises. The really cool thing I've noticed is that I can follow along virtually key for key. Solving systems of linear equations is just a tad slicker on the 50g. But the 48GX/Alg48 can do systems of arbitrary polynomials, to boot. It almost seems like the 49g+/50g are the 48GX with a less solid keyboard & much shorter battery life.

[rolinychupetin]

@sbergman27 Yes, I also have an HP-48GX. It is a magnificent machine. It was, as far as I know, the last of the "Hewlett-Packard pure breed" calculators. When they looked like the famous and respected line of HP lab instruments line. The 50g is faster, and the ROM has been expanded a lot, but I miss the old true-HP look I grew used to, from my HP-35, my classmates HP-45, my HP-25, HP-67, HP-41CV up to the HP-48GX.

[rolinychupetin]

This is a belated response to "trese0000' question below who has already found out how to do this: Just in case there is someone else wondering how to display matrices that way, just go to MODE/FLAGS and set the system flag #98 to Vector:vert disp.

[Morphoser]

I like your Videos about the HP Calculator. I am from Germany and own a HP 48G for many years. I got a Problem about solving a {2 2} Matrix. I can do it by hand but it would be nice to it with the HP 48G. I upload a picture, where you can see my Problem. My english isnt that good but I hope you understand my picture. The Next step is to get the Eigenvectors (not shown on this pic). Maybe its possible to it in one step. I send you a link to the picture. Greetz from Germany

[sbergman27]

@rolinychupetin My 48SX was stolen & I remember being not too pleased with its replacement's pastels. The other old friend I've pulled down from storage recently is my trusty old high school buddy, the TI-59. I remember well the secret 41C envy I harbored. I recently had the opportunity to learn a little of the 41's language & to write a prime numbers finder for it. Very similar to the 59's. But.. now I'm noticing the 41C's strong influence on the UserRPL language of the 48. Thanks for the vids.

[ScrubbyK]

I first saw this video probably 3 or 4 years ago and now that I forgotten how to use my HP50g ... I google 'hp50g phasors' and what do you know ... the is the first thing listed! Thanks Dr. Linares!

[trese0000]

Thanks Anyway, I found out the trick. I had to set a flag to make the matrix become vertical instead of horizontal.

[trese0000]

I have a huge question. I notice whenever you ask you calculator to make you an array, your matrices comes out in a square form "stacked'. The trouble I am having with mines is that my elements are being displayed like a row vector. All of its elements you have to read from left to right like a sentence. I want to get it to display it in a fashion of how textbook do or how yours display the matrix. If you can help would be awesome. Thank You. P.S. I was thinking it may have to deal w/ sig. figs.

[DrWmPierceAudio]

Nice video man!