r - How do I replace multiple column names with substring -


i want edit multiple column names substring(). code wrote isn't working.

weirdly enough following code works. old column names:

oldcolnames <- names(forcesdf[,c(5:20)])

results in:

> names(forcesdf[,c(5:20)]) [1] "2000 [yr2000]" "2001 [yr2001]" "2002 [yr2002]" "2003 [yr2003]" "2004 [yr2004]" "2005 [yr2005]" "2006 [yr2006]" [8] "2007 [yr2007]" "2008 [yr2008]" "2009 [yr2009]" "2010 [yr2010]" "2011 [yr2011]" "2012 [yr2012]" "2013 [yr2013]" [15] "2014 [yr2014]" "2015 [yr2015]"

and new column names:

newcolnames <- substring(names(forcesdf[,c(5:20)]), 1, 4) oldcolnames <- newcolnames

results in excually want:

> oldcolnames [1] "2000" "2001" "2002" "2003" "2004" "2005" "2006" "2007" "2008" "2009" "2010" "2011" "2012" "2013" "2014" "2015"

of course, want change column names in dataframe initially, wrote following code colnames didn't change.

names(forcesdf[,c(5:20)]) <- substring(names(forcesdf[,c(5:20)]), 1, 4)  > names(forcesdf[,c(5:20)]) [1] "2000 [yr2000]" "2001 [yr2001]" "2002 [yr2002]" "2003 [yr2003]" "2004 [yr2004]" "2005 [yr2005]" "2006 [yr2006]" [8] "2007 [yr2007]" "2008 [yr2008]" "2009 [yr2009]" "2010 [yr2010]" "2011 [yr2011]" "2012 [yr2012]" "2013 [yr2013]" [15] "2014 [yr2014]" "2015 [yr2015]"

test this

names(forcesdf)[5:20] <- substring(names(forcesdf[,c(5:20)]), 1, 4)

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