I want to change the type to factor of all variables in a data frame whose
names match a certain pattern.
So here I am trying to change the type to factor of all variables whose name
begins with namestub in the dataframe df.
attach(df)sapply(grep(glob2rx("namestub*"),names(df)),as.factor)
But this doesn't work since
>levels(df$namestub1)NULL
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