Hi all, I am reading a field data that contains several variables. The sample of the data with the first two variables is shown below. I wanted to know the minimum and maximum recording date However, I have some problem.
Name Rdate V1 to V20 Alex1 01/03/2015 Alex2 01/03/2014 Alex3 31/12/2012 Alex4 15/01/2011 Alex150 22/01/2010 Alex151 15/02/2011 DF1=DF1[!is.na(DF1$Rdate),] range(DF1$Rdate, na.rm=TRUE) Warning message: In is.na(DF1$Rdate) : is.na() applied to non-(list or vector) of type 'NULL' Error in DF1$Rdate : $ operator is invalid for atomic vectors Execution halted I am expecting the Rdate field should contain recording dates. I am suspecting there might be a non date value in that columns. How do I remove that row if it is not a date format? Thank you. ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
