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Re: Operate on Heads

  • To: mathgroup at smc.vnet.net
  • Subject: [mg86661] Re: Operate on Heads
  • From: Januk <ggroup at sarj.ca>
  • Date: Mon, 17 Mar 2008 00:21:13 -0500 (EST)
  • References: <friu0f$jo$1@smc.vnet.net>

Hi Andy,

A basic approach would be to convert everything to strings, use
Mathematica's string manipulation commands to create the expression
you'd like evaluated, then convert back to an expression.  See below
for a simple example.

f[something_, x__] := Module[{strArgs, strHeads},
  strHeads = ToString[something];
  strArgs = Riffle[ToString /@ {x}, ","];

  (* Manipulate your heads here *)
  strHeads = StringReplace[strHeads, "p" -> "P"];

  StringJoin[strHeads, "[", strArgs, "]" ] // ToExpression
  ]

f[plus, 2, 3]

Hope that helps,
Januk

On Mar 16, 6:49 am, "Dr Andy D Kucar P2EE4 www.radio4u.com"
<a... at radio4u.com> wrote:
> Hi,
>
> Hi,
>
> I would like to be able to pass a composite name Head, e.g.,
> FirstSecondThird to a Module,
> and then, inside the module, use
>
> FirstSecondThird, First, Second, Third
>
> Heads, and/or make other Operate ions on Heads
>
> How could this be accomplished?
> Thank you
>
> Sincerely Andy



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