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Re: Hold & Evaluate

  • To: mathgroup at smc.vnet.net
  • Subject: [mg129907] Re: Hold & Evaluate
  • From: Bob Hanlon <hanlonr357 at gmail.com>
  • Date: Mon, 25 Feb 2013 02:20:18 -0500 (EST)
  • Delivered-to: l-mathgroup@mail-archive0.wolfram.com
  • Delivered-to: l-mathgroup@wolfram.com
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  • References: <20130224043140.94A9B6873@smc.vnet.net>

m = 5;

seq = Table[
  ToString[n] <> "/" <> ToString[1.1 n + 0.1],
  {n, m}]

{"1/1.2", "2/2.3", "3/3.4", "4/4.5", "5/5.6"}

seq // ToExpression

{0.833333, 0.869565, 0.882353, 0.888889, 0.892857}


Bob Hanlon


On Sat, Feb 23, 2013 at 11:31 PM, =C5 er=C3=BDch Jakub <Serych at panska.cz> wrote:
> Dear mathgroup,
> I would like to generate sequence in the form:
>
> 1/1.2, 2/2.3, 3/3.4, 4/4.5, etc.
>
> It is very simple by a Table function:
>
> Table[n/(n + 0.1 (n + 1)), {n, 1, 15}]
>
> but as there are real numbers in denominators, Mathematica evaluates all and generates something like:
>
> {0.833333, 0.869565, 0.882353, 0.888889, 0.892857, 0.895522, etc.}
>
> How to evaluate numerators and denominators separately and print the sequence in that "fraction like" form?
>
> I tested:
>
> #[[1]]/#[[2]] & /@ Table[{n, n + 0.1 (n + 1)}, {n, 1, 15}] and than used Hold[] and Evaluate[]:
>
> Hold[Evaluate[#[[1]]]/Evaluate[#[[2]]]] & /@
>  Table[{n, n + 0.1 (n + 1)}, {n, 1, 15}]
>
> But it doesn't work as the Hold has "veto" power over any evaluation.
>
> Thanks in advance for any idea, how to do it
>
> Jakub
>



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