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Date: Fri, 11 Apr 2003 10:46:16 -0700
To: cygwin@cygwin.com
From: Randall R Schulz <rrschulz@cris.com>
Subject: Re: bash and real arithmetic
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At 10:21 2003-04-11, Igor Pechtchanski wrote:
>On Sat, 12 Apr 2003, Stepan Yakovenko wrote:
>
> > HI!
> >
> >   Is it possible to get for loops working
> >   in double arithmetic in bash ? I've got to run
> >   a program with a real argument many times, changing it
> >   every run by some fixed small (<1) number.
> >
> >   Thanx in advance, sorry for my broken English.
>
>Umm, scale?  For example:
>
>    for (( i=0; i < 10; i++ )); do echo 0.$i; done

Umm, leading zero suppression?

% for (( i=0; i < 100; i++ )); do echo 0.$i; done

0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
0.10
0.11
0.12
0.13
0.14
0.15
0.16
0.17
0.18
0.19
0.20

etc.


>You could also try using something like awk for driving the loop:
>
>    awk 'BEGIN {for (i=0; i < 1; i+=0.1) system("echo " i)}' < /dev/null
>
>Hope this helps,
>     Igor


Randall 


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