       Re: How can this MapAt application be done more efficiently

• To: mathgroup at smc.vnet.net
• Subject: [mg4222] Re: [mg4180] How can this MapAt application be done more efficiently
• From: jpk at apex.mpe.FTA-Berlin.de (Jens-Peer Kuska)
• Date: Tue, 18 Jun 1996 03:27:02 -0400
• Sender: owner-wri-mathgroup at wolfram.com

```> I have written a function to Drop any zero's from a table of numbers.
> Here is an example:
>
> 	In:= dropzero[ {{5, 0}, {4, 1}, {3, 2, 0}, {3, 1, 1}} ]
>
> 	Out= {{5}, {4, 1}, {3, 2}, {3, 1, 1}}

Hi Joel,

With
In[]:=
lst={{1,2,0,5,0},{4,6},{0,0,3,4,6,0}};

Try

In[]:=

lst //. {a___,0,b___} :> {a,b}

Out[]=
{{1, 2, 5}, {4, 6}, {3, 4, 6}}

to remove all zeros and
try

lst //. {a___,0} :> {a}

to remove only zeros at the end of every list.

Hope that helps

Jens

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```

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