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Date: Mon, 28 Oct 2013 17:55:05 +0000
From: Peter Stephenson <p.stephenson@samsung.com>
To: zsh-users@zsh.org
Subject: Re: Twitter Daily ZSH Tip
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On Mon, 28 Oct 2013 10:34:59 -0700
Eric De Mund <ead@ixian.com> wrote:
> > vi *(.om[$1])   # vim newest file
> 
> Problem here:
> 
>     % vi *(.om[$1])         
>     zsh: bad math expression: operand expected at `'

I think you want

  vi *(.om[1])

or if you wanted to be really different

  vi *(.Om[-1])

Otherwise you're substituting a positional parameter, which you don't
want.  The error you got comes from it being empty, so there's no
number, which is what it's complaining about, slightly cryptically.

pws