Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!uunet!bonnie.concordia.ca!clyde.concordia.ca!nstn.ns.ca!cs.dal.ca!silvert
From: silvert@cs.dal.ca (Bill Silvert)
Newsgroups: comp.sys.handhelds
Subject: HP48 features -- what objects can be used?
Message-ID: <1991Feb10.181833.16827@cs.dal.ca>
Date: 10 Feb 91 18:18:33 GMT
Distribution: na
Organization: Habitat Ecology Div., Bedford Inst. of Oceanography
Lines: 31

As a novice I may be missing something, but I would like to be able to
use some of the super features of the 48 for handling arrays, but they
all seem to deal with numbers.  I've worked around my problems by
writing programs, but it seems a shame to lose some of the 48's power.

For example, consider rotation by an angle stored in variable THETA.
I would love to be able to write equations like Y = A * X where X and Y
are 2D vectors and A is the array whose elements are cos(THETA), etc.
(Even better if I could solve for THETA!)

Also, it would be nice to construct an array from two vectors like this:

		[1,2]
		[3,4]
		2
		ARRY->

to get
		[[1,2] [3,4]]

but the objects have to be real numbers it seems (I haven't tried complex).

There are lots of similar things that would be nice to do, like
integrating vectors and so on.  Are any of these things possible?
I may have entered things wrong, but I can't even integrate a dot
product of two vectors, which is after all a scalar!
-- 
William Silvert, Habitat Ecology Division, Bedford Inst. of Oceanography
P. O. Box 1006, Dartmouth, Nova Scotia, CANADA B2Y 4A2.  Tel. (902)426-1577
UUCP=..!{uunet|watmath}!dalcs!biomel!bill
BITNET=bill%biomel%dalcs@dalac	InterNet=bill%biomel@cs.dal.ca