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MathGroup Archive 1995

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Paolo's question

  • To: mathgroup at smc.vnet.net
  • Subject: [mg2394] Paolo's question
  • From: wself at viking.emcmt.edu (Will Self)
  • Date: Tue, 31 Oct 1995 23:24:22 -0500

Paolo asked how, given a list of pairs, each of which has a number for
its second entry, to find the first entry of that pair for which the
second is a maximum among all the second entries.  The following gets
all such first entries in case the maximum is attained more than once.

In[1]:= quack={ {a,2}, {b,4}, {c,1}, {d,4} };

In[2]:= First /@ Cases[quack, {_,Max[Last /@ quack]}]

Out[2]= {b, d}

Will Self


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