Simple filtering in R, but with more than one value -

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i aware of how extract data based on condition, whenever try multiple conditions, struggle ensues. have data , want extract years df. here example df:

year  value 2006  3 2007  4     2007  3 2008  5 2008  4 2008  4 2009  5 2009  9 2010  2 2010  8 2011  3 2011  8 2011  7 2012  3 2013  4 2012  6

now let's want 2008, 2009, 2010, , 2011. try

df<-df[df$year == c("2008", "2009", "2010", "2011"),]

doesn't work, then:

df<-df[df$year == "2008" & df$year == "2009"    & df$year == "2010" & df$year == "2011",]

no error messages, empty df. missing?

you need use %in% , not== 

 df[df$year %in% c(2008, 2009, 2010, 2011),]     year value 4  2008     5 5  2008     4 6  2008     4 7  2009     5 8  2009     9 9  2010     2 10 2010     8 11 2011     3 12 2011     8 13 2011     7

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