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Re: match 1, replace 2


Hi,

ls = {{1, 2, 3}, {4, 5}, {6, 7, 8, 9}};

ls /. {a__Integer, b_Integer} :>

    {Sequence @@ Flatten[{100 + #, -1} & /@ {a}], 
b}

???

Regards

  Jens

"Trevor Baca" <trevorbaca at gmail.com> schrieb im 
Newsbeitrag news:d42khj$3ac$1 at smc.vnet.net...
> 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.
> 



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