Path: utzoo!utgpu!news-server.csri.toronto.edu!clyde.concordia.ca!uunet!timbuk!cs.umn.edu!uc!noc.MR.NET!msi.umn.edu!umeecs!zip!bagchi From: bagchi@eecs.umich.edu (Ranjan Bagchi) Newsgroups: comp.sys.handhelds Subject: Re: the search for the godlike handheld Message-ID: Date: 15 Nov 90 02:38:49 GMT References: <1990Nov15.000438.13116@portia.Stanford.EDU> Sender: news@zip.eecs.umich.edu Organization: University of Michigan Lines: 27 In-Reply-To: mcgrant@elaine3.stanford.edu's message of 15 Nov 90 00:04:38 GMT To: In article <1990Nov15.000438.13116@portia.Stanford.EDU> mcgrant@elaine3.stanford.edu (Michael Grant) writes: In article bagchi@eecs.umich.edu (Ranjan Bagchi) writes: > I'm looking for something to replace my HP28C. It's logical, I >guess, to go to a 48SX. One problem, tho. One of my main beefs with >the 28 is that I can't have variables in a vector or matrix. It's >variable. Didn't work. > So...is there any plans in the work to put this into the >matrix operations? It really doesn't make much sense, at least to me. Well, it certainly would be awfully nice to have symbolic matrix operations. For example, I would like to be able to calculate (sI-A)^-1 almost daily. However, have you considered how much MORE programming that would require to do such a thing? The fact of the matter is that I am more than impressed with the amount of symbolic math that the HP calculators do, and we tend to get spoiled into expecting more! Unfortunarly, the emacs calc mode (modeled after the HP line of calculators), does support this. I'm naively assuming that it's a matter of how object-oriented the programming style is. One matrix-user's opinion, Michael C. Grant mcgrant@portia.edu (If anyone wants that resolvent program, e-mail me...I have a corollary program that calculates c(sI-A)^-1b as well, even for multi-input, multi- output systems...)