Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!sdd.hp.com!hp-pcd!hpcvra.cv.hp.com!rnews!hpcvbbs!akcs.cheilman
From: akcs.cheilman@hpcvbbs.UUCP (Chris Heilman)
Newsgroups: comp.sys.handhelds
Subject: Re: RE: Sky on Compuserve
Message-ID: <285b8caa:3427.2comp.sys.handhelds;1@hpcvbbs.UUCP>
Date: 16 Jun 91 16:40:05 GMT
References: <C678731BE0002A9F@gacvx2.gac.edu> <1991Jun10.225842.871@stat.appsta
Lines: 24

Tim,
    When I wrote Sky, I went to the library and checked out Duffett-Smith
to learn the geometric algorithms used.  I then wrote code to implement
those algorithms while optomizing them for speed and size (not accuracy)
to run in a reasonable amount.  I credited Mr. Duffett-Smith's work in
Sky's documentation and in the comments of the source code. I have bought
a copy of the book. The hp calculators probably account for more sales of
the book than anything else.

    This is the manner, I believe, that books are meant to be used: adapt
and credit the information, make sure that any derivative work is unique
and copyright the new work.  In this manner you have given the author his
due (you or sombody bought the book, and someone may buy it based on your
citation ) and also retained the value of your contribution.

    I would love to get my hands on your routines, but be forewarned, I
may wish to use them in a future version of Sky.  Come to think of it,
you may wish to use Sky's interface, wanna trade source for source?

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:    __                ,    Chris Heilman  Phoenix College  Chemistry   :
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:  Author of Pocket Forth      US Mail>     85066-8345    (personnal)   :
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