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Re: match 1, replace 2


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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