I am using dataframes and I and I want to delete (remove) a specific column by name ... the data frame has 14 columns with several names and only need some. I tried to overwrite the columns with a single value but that in not very clean as I need to export the data to file. The rm command gives me a warning message stating : < remove: variable "rtu$Ri." was not found > or there is another method to remove parts of a dataframe? thanks in advance Mark Marques
On Fri, 30 May 2003, Mark Marques wrote:> I am using dataframes and I and I want to delete (remove) a specific > column by name ... > the data frame has 14 columns with several names and only need some. > I tried to overwrite the columns with a single value but that in not very > clean as I need to export the data to file. > The rm command gives me a warning message stating : > < remove: variable "rtu$Ri." was not found > > or there is another method to remove parts of a dataframe?You make a copy selecting the names you want, as in rtu2 <- rtu[!(names(rtu) %in% c("Ri", "another I do not want"))] or rtu3 <- rtu[c("var2", "var7")] -- Brian D. Ripley, ripley at stats.ox.ac.uk Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UK Fax: +44 1865 272595
or, if you no longer want the columns and don't want to create more objects, you could: rtu$Ri <- NULL On Fri, 2003-05-30 at 11:51, Mark Marques wrote:> > I am using dataframes and I and I want to delete (remove) a specific > column by name ... > the data frame has 14 columns with several names and only need some. > I tried to overwrite the columns with a single value but that in not very > clean as I need to export the data to file. > The rm command gives me a warning message stating : > < remove: variable "rtu$Ri." was not found > > or there is another method to remove parts of a dataframe? > thanks in advance > Mark Marques > > ______________________________________________ > R-help at stat.math.ethz.ch mailing list > https://www.stat.math.ethz.ch/mailman/listinfo/r-help