
Re: [mg4180] How can this MapAt application be done more efficiently
Posted:
Jun 16, 1996 2:09 AM


> 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

