[R] why data frame's logical index isnt working
dwinsemius at comcast.net
Fri Apr 8 04:29:04 CEST 2016
> On Apr 7, 2016, at 6:46 PM, Michael Artz <michaeleartz at gmail.com> wrote:
> data.frame.$columnToAdd["CurrentColumnName" == "ConditionMet"] <- 1
> Can someone please explain to me why the above command gives all NAs to
> columnToAdd? I thought this was possible in R to do logical expression in
> the index of a data frame
It is possible, but please execute this at a console line and then read ?"[" to see what is happening:
"CurrentColumnName" == "ConditionMet" # almost surely FALSE
Let's assume your dataframe were named 'dat'.
Perhaps you meant to write:
dat$colToAdd[ dat[["CurrentColumnName"]] == dat[["ConditionMet"]] ] <- 1
And do please stop naming your dataframes "data.frame".
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