I want to know if is possible to find a calculator program to solve "Linear Programming" problems.
I didn´t studied the Simplex algorithm yet, so I am not sure if is possible to put it on HP-41/42 series.
Any comment?
Linear Programming
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04-30-2004, 03:19 PM
04-30-2004, 03:50 PM
Hi!
04-30-2004, 05:00 PM
Hi, Jean-Marc; first of all, congrats! Your Simplex program for the HP41 is a nice piece of art! Clean, concise and explores many of the HP41 software capabilities. I did not have the time to go further and analyse it, but I wonder about one thing: have you used synth instructions in order to use system registers and leave all numbered registers available OR is there any particular need? I mention again that I did not analyse the program "in deep", but I decided to ask you first before getting to wrong conclusions ;^) Another issue: have you thought about Operational Research and Linear Programming as well? Simplex is one of the methods. I've been reasoning about developing some sort of a portable GAMS (or LINDO) version to run in an HP49G; as I am about to get an HP49G+ with extra RAM memory, so I think it's something to be considered. I used an HP49G to hold some small programs to be used in Fuzzy Logic and Artificial Neural Networks, but I never put them together in order to form a complete system. I'm daring to go ahead with Operational Research. Have you done something in this area as well? BTW, folks, if there is anyone interested in this subject, let's just start a thread. Cheers and thanks. Luiz (Brazil)
05-01-2004, 02:36 AM
Quote: Careful, the 49g+ has actually less RAM available to the user than the 49. But it is much faster. Arnaud
05-01-2004, 09:08 AM
Hi, Arnaud; thank you for your warnning! If you plug a RAM card on an HP49G+, how is it this RAM seen by the O.S.? I'm asking this because if its contents can be handled as some sort of "extension" (as it happens in BANK 1 of the HP49G), I guess it will do fine running programms in main memory and data in this "extra" RAM. I remember that I was worried about speed in this case, but I never took any performance measurement. Any information about this? Thank you again. Cheers. Luiz (Brazil)
05-01-2004, 09:34 AM
The 49g+ has 256K RAM in port 0 However the size of programs or data is limited to 128k and no library can be executed from the SD card. I hope this helps Arnaud
05-01-2004, 01:09 PM
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05-01-2004, 04:15 PM
Hi! Thank you!
05-01-2004, 05:28 PM
" I've written a Simplex program for the HP-48GX a couple of weeks ago. If you are interested, I can send you a copy of this program"
05-01-2004, 07:30 PM
Hello Jean-Marc, Velli-Pekka, folks; Yes, I'm much interested on your program (I added my e-mail address in the end of the post). Can I "dig it" and try to reason over the algorithm you use? I'm actually starting to deal with Operational Research for academic matters, and there are other solution methods I'm gonna work with. Simplex is one of them, and I would like very much to see how did you accomplish the task of programming it in RPL. As I'm getting through it I'm posting messages, if there is any interest on this subject by you or others. Veli-Pekka, are you dealing with related subjects as well? Just curiosity of mine. Cheers. Luiz (Brazil) lcvieira@quantica.com.br
05-02-2004, 04:21 AM
"Veli-Pekka, are you dealing with related subjects as well? Just curiosity of mine."
05-03-2004, 09:36 AM
Thanks Jean and the others. Guillermo |
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