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Re: how to take quotation marks away ?

• To: mathgroup at smc.vnet.net
• Subject: [mg48541] Re: how to take quotation marks away ?
• From: "Peter Pein" <petsie at arcor.de>
• Date: Fri, 4 Jun 2004 04:50:56 -0400 (EDT)
• References: <c9k3op$fe7$1@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

"Florian Jaccard" <florian.jaccard at eiaj.ch> schrieb im Newsbeitrag
news:c9k3op$fe7$1 at smc.vnet.net...
> Dear Mathematica-specialists,
>
>
>
> I have a  (long)  list of the form   {{"42.1,3.3"},{"3.1,4.2"}}
>
> How can I transform it to obtain  {{42.1,3.3},{3.1,4.2}} ?
>
> I tried ToExpression, but it failed.
>
>
>
> Thanks in advance !
>
>
>
> Greetings
>
>
>
> F.Jaccard
>
>
Florian,
transform each list containing one string s to a string "{"<>s<>"}" and
apply ToExpression:

data = {{"42.1,3.3"}, {"3.1,4.2"}};
val = ToExpression[ToString[#]] & /@ data
   {{42.1, 3.3}, {3.1, 4.2}}


Map[Head, val, {-1}]
   {{Real, Real}, {Real, Real}}

-- 
Peter Pein, Berlin
to write to me, start the subject with [