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Article #999Re: Math routines (was bourne shell query)
From: richard.a.stewart
Date: Mon, 03 Sep 1990 22:36
Date: Mon, 03 Sep 1990 22:36
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1751 bytes
In article <2494@uc.msc.umn.edu>, glex@uh.msc.umn.edu (Jeffrey Gleixner) writes:
> > In article <SCOTT.90Aug30124930@tab00.larc.nasa.gov> writes:
> > >As a side question, does ANYONE have any bourne shell routines which do
> > >math... reasonably effeciently? (For numbers > 1000?)
> If you're going to do a lot of math write a {your favorite language besides
> *sh here} program to do the math for you. Even if you're doing a small
> amount of math it will really speed it up.
Generally concur except for prior suggestion re "expr".
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Not my favorite language(:-) but one might also consider
a (Bourne) shell counting function using dc:
cnt() { echo "[p1+d${2}!<0]s0${1}l0xq"|dc; }
This counts at a rate of about 100/second (on a 3B2) which may be adequate
for many shell programming purposes although MUCH slower than "count".
The function saves 99.6+% in "diskspace" over a private a.out from count.c;
"count" of course might well be shared by all users as /usr/lbin/count.
-----
Other possibilities for consideration could include bc, awk, awkcc,
various public domain calculators and "Hoc" (SEE Appendices 2&3 of
"The UNIX Programming Environment" by Kernighan & Pike)
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!mailrus!uunet!tut.cis.ohio-state.edu!att!cbnewsl!stewart From: stewart@cbnewsl.att.com (richard.a.stewart) Newsgroups: comp.unix.shell Subject: Re: Math routines (was bourne shell query) Summary: usa Keywords: Use C Message-ID: <1990Sep3.223654.24139@cbnewsl.att.com> Date: 3 Sep 90 22:36:54 GMT References: <26DC6447.15922@maccs.dcss.mcmaster.ca> <8446@orca.wv.tek.com> <2494@uc.msc.umn.edu> Distribution: usa Organization: AT&T Bell Laboratories Lines: 24