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Re: C/Fortran-like #include functionality for large expressions?

• To: mathgroup at smc.vnet.net
• Subject: [mg123575] Re: C/Fortran-like #include functionality for large expressions?
• From: Bob Hanlon <hanlonr357 at gmail.com>
• Date: Sun, 11 Dec 2011 03:50:07 -0500 (EST)
• Delivered-to: l-mathgroup@mail-archive0.wolfram.com
• References: <201112101226.HAA19213@smc.vnet.net>

This is a scoping issue. The variable a inside the module is not the
same as the a in the string.

Clear[testInclude]

testInclude[] := Module[{a},
  Print[a];(* the actual variable name within Module *)
  a = 2.;
  ToExpression[StringReplace[p,
    "a" -> ToString[HoldForm[a]]]];
  Print[a]]

p = "a=3.";

testInclude[]

a$104

3.


Bob Hanlon


On Sat, Dec 10, 2011 at 7:26 AM, Frank Iannarilli <frankeye at cox.net> wrote:
> Hi All,
>
>
> Is there any C #include or similarly Fortran INCLUDE functionality I can gain within Mathematica?  The purpose is to enhance readability of very large function definitions or Manipulate[] invocations, by splicing-in "chunks" of code (expressions) defined in separate cells.
>
> Here's an example of an attempt that doesn't work:
>
> testInclude[] :=
>  Module[{a}, a = 2.; ToExpression[p];  Print[a]]
>
> p = "a=3."     // The expression chunk to "include"
>
> testInclude[]
> // would like this to return "3", but stuck returning "2".
>
> Thanks,
> Frank
>

• References:
  • C/Fortran-like #include functionality for large expressions?
    • From: Frank Iannarilli <frankeye@cox.net>