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Re: Evaluating Global Variables Named Strings as Variables

• To: mathgroup at smc.vnet.net
• Subject: [mg105491] Re: Evaluating Global Variables Named Strings as Variables
• From: BenT <brtubb at pdmusic.org>
• Date: Sat, 5 Dec 2009 05:32:32 -0500 (EST)
• References: <hfalai$73l$1@smc.vnet.net>

Thanks to Bob Hanlon, for pointing out to me two solutions, for which
I choose the second, namely:

[1]

Grid[
 a = {#, ToExpression[#]} & /@
   {"$AddOnsDirectory",
    "$BaseDirectory"},
 Spacings -> {1.5, 1.5}]

[2]

Column[Flatten[
  a = {#, ToExpression[#]} & /@
    {"$AddOnsDirectory",
     "$BaseDirectory"}],
 Spacings -> 1.5]

Which for my purposes was adapted to

Column[Flatten[
  a = {#, ToExpression[#]} & /@
    Names["System`$*"]],
 Spacings -> 1.5]

--- Ben


On Dec 4, 3:38 am, BenT <brt... at pdmusic.org> wrote:
> Consider the output of this:
>
> a=Names["System`$*"]
>
> How does one then process/evaluate each String element of the
> resulting List, as the global function name which it represents?
>
> For a more direct (simpler) example: if given
>
> a={$AddOnsDirectory,$BaseDirectory}
>
> Then this output is obtained.
>
> {C:\Documents and Settings\All Users\Application Data\Mathematica,C:
> \Documents and Settings\All Users\Application Data\Mathematica}
>
> However what I really want to be able to do is process "a" somehow so
> that I get the effect of multiple Input cells with their corresponding
> Output cells displayed, namely:
>
> $AddOneDirectory
>
> C:\Documents and Settings\All Users\Application Data\Mathematica
>
> $BaseDirectory
>
> C:\Documents and Settings\All Users\Application Data\Mathematica
>
> How is this achieved?
>
> --- Benjamin Tubb

• Follow-Ups:
  • Re: Evaluating Global Variables Named Strings as
    • From: Syd Geraghty <sydgeraghty@me.com>