bash and real arithmetic

[wayne]

Not on topic but you could also use awk for fractional math.
AWK is quite good at math.

On Fri, Apr 11, 2003 at 01:00:37PM -0700, Peter A. Castro wrote:
> On Fri, 11 Apr 2003, Igor Pechtchanski wrote:
> 
> > On Fri, 11 Apr 2003, Randall R Schulz wrote:
> > 
> > > 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
> > > [snip]
> > > 0.20
> > > etc.
> > > Randall
> > 
> > Yes, yes...  It was an /example/.  If you want leading zeros for numbers
> > greater than 10, use bash's "printf" builtin:
> >    for (( i=0; i < 100; i++ )); do echo 0.$(printf "%02d" $i); done
> > Better? :-p
> > 	Igor
> 
> zsh does integer math, but since you want fractional math, zsh won't do.
> You could simply use 'bc'.  Eg:
> 
> $ x='2.2'
> $ x=`echo $x+0.3 | bc`
> $ echo $x
> 2.5
> 
> -- 
> Peter A. Castro <doctor@fruitbat.org> or <Peter.Castro@oracle.com>
> 	"Cats are just autistic Dogs" -- Dr. Tony Attwood
> 
> 
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