Re: Import variable and data
- To: mathgroup at smc.vnet.net
- Subject: [mg32730] Re: Import variable and data
- From: lalu_bhatt at yahoo.com (Bhuvanesh)
- Date: Thu, 7 Feb 2002 05:10:34 -0500 (EST)
- References: <a3qs8q$2c4$1@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
"Mark Van De Vyver" <mvdv at bigfoot.com> wrote:
> 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.
Use Evaluate:
Evaluate[ToExpression[inputData[[1]]]] = inputData[[2]]
This way, it will evaluate the left-hand expression before doing the assignment.
--
Bhuvanesh,
Wolfram Research.