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MathGroup Archive 2010

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List to infix

  • To: mathgroup at smc.vnet.net
  • Subject: [mg113017] List to infix
  • From: Hugo Touchette <hugo.touchette at googlemail.com>
  • Date: Mon, 11 Oct 2010 05:16:12 -0400 (EDT)

Hi,

A problem about infix notation. In simple terms, I want to transform
the list

{1, Plus, 3, Times, 5, Plus, 5}

into the infix form

1~Plus~3~Times~5~Plus~5

to get a numerical result (here 25). Is there an easy way to do this?
The lists I'm working with are actually much longer, so I want
something efficient.

I've tried using Infix[mylist,"~"], but the ~ there is a string, not
the infix operator. In the end, I simply wrote

ListOperation2[l_] := Module[{res, i},
  res = l[[1]];
  Do[
   res = res~l[[i]]~l[[i + 1]]
   , {i, 2, Length[l], 2}];
  res
  ]

This works, but I thought there might be a more efficient way to do
things.

Thanks in advance for any help.

oguh


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