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Re: List Position


Harry flynn schrieb:
> 
> Can anyone tell me how I find the position in a list of the first
value
> less than or equal to zero.
> For example, how can I get Mathematica to tell me that in the list
> {{1},{1},{2},{8},{-3}}
> that the first value of interest to me is position 5. Thanks in
advance.
> Harry.

What about this:

e.g. the list l:

l={{1},{1},{2},{8},{-3},{4},{-1},{0}};


finding the element {-3} functions as follows:

i=1;While[i<Length[l],
  If[l[[i,1]]<=0,{Print[l[[i]]," at Position ", i],i=Length[l]+1},i++]]

wr

Joerg


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