[R] date columns chooser

i have a data frame with 2 columns of dates. with str(dataframe) i have ensured myself that they were indeed formatted as dates. one column has NA's in it. the aim is now to make a third column that chooses date1 if it is a date, and choose date2 if it is a NA. i am trying df$date3=ifelse(is.na(d

[R] installing package tkrplot

package tkrplot worked, but has broken while installing from R 2.11 to 2.14.2. it does not want to be installed anymore on a linux debian squeeze 64 system. have tried: - installing from source R: CMD INSTALL tkrplot_0.0-23.tar.gz - via synaptic: package r-cran-tkrplot - via terminal: sudo apt-get