Message-ID: <CAPRmSMFows=mdQOk5bD_zPSOC_eVReTj9_rz=Hm0a-GCO5TE4g@mail.gmail.com>
Date: 2012-05-10T19:50:28Z
From: Gregorio R. Serrano
Subject: [R-es] Respuesta y consulta sobre formato columnas data.frame
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