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MathGroup Archive 2002

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Re: Import variable and data

  • To: mathgroup at smc.vnet.net
  • Subject: [mg32739] Re: Import variable and data
  • From: "Mark Van De Vyver" <mvdv at bigfoot.com>
  • Date: Thu, 7 Feb 2002 05:12:21 -0500 (EST)
  • Organization: The University of Western Australia
  • References: <a3qr9f$29m$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Thanks to those that responded... one solution suggested was:

Hold[
            ToExpression[
                                    inputData[[1]]
                                ]
        ] = inputData[[2]]

Thanks again

Mark


"Mark Van De Vyver" <mvdv at bigfoot.com> wrote in message
news:a3qr9f$29m$1 at smc.vnet.net...
> Hi MathGroup,
>
> I'm having trouble with the following variable and data import:
> The import file is input.txt:
>
> a b c d
> 1 23 45 678
>
> inputData=Import[input.txt,"Table"]
> {{a,b,c,d},{1,23,45,678}}
>
> This all works OK.
> Head[..]  indicates the a,b,c and d are strings, which is fine, because
> ToExpression[..] changes them to symbols.  What I'd like to do is use
> inputData to do the following:
>
> {a,b,c,d}={1,23,45,678}
>
> However, if I try
>
> ToExpression[ inputData[[1]] ] = inputData[[2]]
>
> I get an error:
>
> Set::write: Tag ToExpression in ToExpression[a] is Protected.
>
> If I then enter 'a' in Mathematica I do not get 1 returned!  No matter how
I try I
> can't work it so that when I enter the symbol 'a' in Mathematica I get the
value
> from inputData[[2]].
>
> Not sure if that makes sense?
>
>
>




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