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 [