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Re: How can this MapAt application be done more efficiently


> I have written a function to Drop any zero's from a table of numbers.
> Here is an example:
> 
> 	In[161]:= dropzero[ {{5, 0}, {4, 1}, {3, 2, 0}, {3, 1, 1}} ]
> 
> 	Out[161]= {{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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