Re: match 1, replace 2

• To: mathgroup at smc.vnet.net
• Subject: [mg56239] Re: [mg56199] match 1, replace 2
• From: "Christoph Lhotka" <lhotka at astro.univie.ac.at>
• Date: Wed, 20 Apr 2005 05:30:15 -0400 (EDT)
• Sender: owner-wri-mathgroup at wolfram.com

```Hi, I do not see what you want to achieve with Sequence[100+n,-1], but the
right pattern to do some substitution like yours is:

In[..]:= ls = {{1, 2, 3}, {4, 5}, {6, 7, 8, 9}};

In[..]:= ls /. {n___Integer, m_Integer} :> {f[n], m}
Out[..]:= {{f[1, 2], 3}, {f[4], 5}, {f[6, 7, 8], 9}}

(which means to modifiy all but the last element by some function f...)

with kind regards...

On Tue, 19 Apr 2005 04:54:55 -0400 (EDT)
"Trevor Baca" <trevorbaca at gmail.com> wrote:
> hi mathgroup,
>
> what rule takes
>
> ls = {{1, 2, 3}, {4, 5}, {6, 7, 8, 9}}
>
> to
>
>       {{101, -1, 102, -1, 3}, {104, -1, 5}, {106, -1, 107, -1, 108, -1,
> 9}}
>
> ie, matches all integers but the last in each list and then replaces
> each matched integer n with the 2-element sequence Sequence[100 + n,
> -1]?
>
> trevor.
>

-- Christoph Lhotka --
University of Vienna
Institute for Astronomy
Tuerkenschanzstr. 17
1180 Vienna, Austria
fon. +43.1.4277.518.41
mail. lhotka at astro.univie.ac.at

```

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