Hola Alberto, en el siguiente link es posible que encuentres alguna clave para la solución: http://www.noamross.net/blog/2014/2/10/using-times-and-dates-in-r---presentation-code.html
Espero sea de utilidad. Un saludo, -- *Alexandre Alonso Fernández** *Instituto de Investigaciones Marinas, IIM-CSIC Departamento de Recursos y Ecología Marina Grupo de Ecología Pesquera <http://www.iim.csic.es/pesquerias> El 09/07/2014 14:32, Carlos Ortega escribió: > Hola, > > Obtienes un error por que no indicas el "origin", tal y como refleja > fielmente la documentación: > >> as.Date(as.numeric(Sys.time()))Error in >> as.Date.numeric(as.numeric(Sys.time())) : > 'origin' must be supplied > > > > --------------------------------------------------------------------- > Details > > The usual vector re-cycling rules are applied to x and format so the answer > will be of length that of the longer of the vectors. > > Locale-specific conversions to and from character strings are used where > appropriate and available. This affects the names of the days and months. > > The as.Date methods accept character strings, factors, logical NA and > objects of classes "POSIXlt > <http://127.0.0.1:42870/help/library/base/help/POSIXlt>" and "POSIXct > <http://127.0.0.1:42870/help/library/base/help/POSIXct>". (The last is > converted to days by ignoring the time after midnight in the representation > of the time in specified time zone, default UTC.) Also objects of class > "date"(from package date > <http://127.0.0.1:42870/help/library/date/html/as.date.html>) and "dates" > (from > package chron <http://127.0.0.1:42870/help/library/chron/html/chron.html>). > Character strings are processed as far as necessary for the format > specified: any trailing characters are ignored. > > *as.Date will accept numeric data (the number of days since an epoch), > but only if origin is supplied.* > > The format and as.character methods ignore any fractional part of the date. > --------------------------------------------------------------------- > > Saludos, > Carlos Ortega > www.qualityexcellence.es > > > > > > El 9 de julio de 2014, 14:25, Alberto Soria <[email protected]> > escribió: > >> Hola a todos: >> >> Debe de ser una tonterÃa, pero no consigo saber porque la siguiente linea >> no devuelve la fecha actual: >> >> as.Date(as.numeric(Sys.time())) >> >> He hecho esa prueba porque no consigo pasar un numero convertido a partir >> de una fecha y modificado a fecha de nuevo. >> >> Gracias por adelantado. >> >> Un saludo, >> Alberto. >> >> [[alternative HTML version deleted]] >> >> >> _______________________________________________ >> R-help-es mailing list >> [email protected] >> https://stat.ethz.ch/mailman/listinfo/r-help-es >> >> > > > > _______________________________________________ > R-help-es mailing list > [email protected] > https://stat.ethz.ch/mailman/listinfo/r-help-es <https://twitter.com/FisheriesIIM> [[alternative HTML version deleted]]
_______________________________________________ R-help-es mailing list [email protected] https://stat.ethz.ch/mailman/listinfo/r-help-es
