From: Bart Schaefer <schaefer@brasslantern.com>
To: zsh-users@sunsite.dk
Subject: Re: get array of integers?
Date: Sun, 03 Sep 2006 10:55:07 -0700 [thread overview]
Message-ID: <060903105507.ZM7636@torch.brasslantern.com> (raw)
In-Reply-To: <6a42eec70609030959t2a764bfm36fea2c4783f4f01@mail.gmail.com>
On Sep 3, 9:59am, sam reckoner wrote:
}
} I have been doing
}
} x=$(){1..10}
That's a typo? You mean
x=( {1..10} )
} Is there a better way?
Probably not, except maybe to skip generating the array at all and use a
"for (( x=1; x <= 10; ++x ))" loop. Depends on context, of course.
(Make sure "x" is not already defined as an array, or that loop will
not work properly. Best to explicitly declare "integer x".)
} Also, how can I get a range that steps by 2 instead of by 1 as in
}
} 1 3 5 7 ...
By being sneaky.
typeset -A x
x=( {1..10} )
Now ${(k)x} is an array of odd numbers, and ${(v)x} is an array of
even numbers. To get them in ascending order, use ${(nok)x}. Note
that you have to assign an even number of numbers, that is
x=( {1..9} )
will print an error message and not do the assignment.
Of course this trick doesn't work if you want an array by anything
other than twos. So a more general approach (if you really want to
avoid that "for" loop) would be
typeset -a x
# Count by 7s from 7 to 70
x=( '$(('{1..10}'*7))' )
x=( ${(e)x} )
# Count by 5s from 1 to 51
x=( '$(('{1..10}'*5+1))' )
x=( 1 ${(e)x} )
Of course you can also get really silly:
# Count by 3s from 3 to 30
setopt extendedglob
typeset -a x
x=( {1..10} )
x=( ${x//(#b)(*)/$(($match*3))} )
That's doing a lot of extra work behind the scenes, though, to match
the pattern, store the backreference, etc.
next prev parent reply other threads:[~2006-09-03 17:55 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-09-03 16:59 sam reckoner
2006-09-03 17:55 ` Bart Schaefer [this message]
2006-09-03 20:27 ` Roman Cheplyaka
2006-09-03 21:34 ` Dan Nelson
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