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MathGroup Archive 2001

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RE: Extracting the name of a variable

  • To: mathgroup at smc.vnet.net
  • Subject: [mg26929] RE: [mg26883] Extracting the name of a variable
  • From: "David Park" <djmp at earthlink.net>
  • Date: Fri, 26 Jan 2001 23:30:06 -0500 (EST)
  • Sender: owner-wri-mathgroup at wolfram.com

Mike,

Attributes[nameValue] = HoldFirst;
nameValue[x_] :=
  Module[{c = SymbolName[Unevaluated[x]]},
    c <> " = " <> ToString[x]]

z = 4;

nameValue[z]
"z = 4"

On the other hand,

?z
Global`z
z = 4

Also

OwnValues[z]
{HoldPattern[z] :> 4}

David Park
djmp at earthlink.net
http://home.earthlink.net/~djmp/ 

> From: Mike Yukish [mailto:may106 at psu.edu]
To: mathgroup at smc.vnet.net
> Hello,
> 
> I'd like to make a function that extracts the name of a variable and
> makes a string. So the function would do:
> 
> In:  z = 4
> 
> In: nameExtract[z]
> 
> Out: "z"
> 
> It appears to not be so simple, since once you assign z a value, the
> function SymbolName[z] returns an error. what's the trick?
> 
> I want to do this so I can make a function takes z as an argument, and
> generates a name:value pair  "z=4"
> 



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