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Re: Question about Mathematica


In[1]:= alist = {{{1, 2}, {3, -1}, {2, -4}}, {{1,
      2}, {4, -5}, {6, -8}}, {{2, -1}, {-2, -3}, {-4, 6}}};


In[2]:= SortBy[#, Last][[1]] & /@ alist

Out[2]= {{2, -4}, {6, -8}, {-2, -3}}

-Francesco

On 01/15/2010 12:00 PM, Dominic wrote:
> Hi.  Can someone help me with the following question:
>
> I have a table of a table of number pairs:
>
> {{{1,2),(3,-1),{2,-4)},{{1,2},{4,-5},{6,-8}},{{2,-1},{-2,-3},{-4,6}}}
>
> How may I find the minimum second element in each sub-table?  For
> example, the first sub-table is:
>
> {{1,2},{3,-1},{2,-4}}
>
> I would like to then extract the {2,-4} element from this item.  Then
> the {6,-8} from the second sub-table, then the {-2,-3} element from the
> last.
>
> Thank you,
> Dominic
>
>


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