Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!sdd.hp.com!uakari.primate.wisc.edu!zaphod.mps.ohio-state.edu!pacific.mps.ohio-state.edu!linac!midway!quads.uchicago.edu!keho
From: keho@quads.uchicago.edu (david kehoe)
Newsgroups: comp.sys.handhelds
Subject: Re: Matrix Operations in 48SX?
Message-ID: <1991Apr19.213953.25529@midway.uchicago.edu>
Date: 19 Apr 91 21:39:53 GMT
References: <1991Apr19.023951.11856@midway.uchicago.edu>
Sender: news@midway.uchicago.edu (NewsMistress)
Organization: University of Chicago
Lines: 24

>.20	100
>.30	250
>.50	275
>
>I'd like a program that would do .2*100 + .3*250 + .5*275 = 232.5.

A friend just clued me into the DOT function.  But now to calculate
variances of stock portfolios, I have matrixes that look like this:

.081	.0137	.1
.081	.0137	.2
.014	.0137	.4
-.054	.0137	.2
-.054	.0137	.1

I need to calculate (.081-.0137)^2*.1 + (.081-.0137)^2*.2 etc.
In other words, subtract the 2nd column from the 1st column, square them,
multiply by the third column, and then sum the values.  Easy to do in
a spreadsheet -- can I write a program that will do this to
a matrix?
-- 
"Why my thoughts are my own, when they are in, but when they are out
they are another's." - Susanna Martin, executed for witchcraft, 1681.
Dave Kehoe  keho@midway.uchicago.edu  (312) 753-0119