transpose - transposing rows into multiple columns in R -


i have following data frame df

id year var value 1  2011  x1  1.2 1  2011  x2  2 1  2012  x1  1.5 1  2012  x2  2.3 3  2013  x1  3 3  2014  x1  4 4  2015  x1  5 5  2016  x1  6 4  2016  x1  2

i want transform data in following format

id year  x1  x2  1  2011  1.2 2 1  2011  2   na   1  2012  1.5 2.3 3  2013  3   na 3  2014  4   4 4  2015  5   na 4  2016  2   na 5  2016  6   na

please help

using tidyr library, believe looking for:

df <- data.frame(stringsasfactors=false,           id = c(1l, 1l, 1l, 1l, 3l, 3l, 4l, 5l, 4l),         year = c(2011l, 2011l, 2012l, 2012l, 2013l, 2014l, 2015l, 2016l, 2016l),          var = c("x1", "x2", "x1", "x2", "x1", "x1", "x1", "x1", "x1"),        value = c(1.2, 2, 1.5, 2.3, 3, 4, 5, 6, 2) )  library(tidyr)  df2 <- df %>%    spread(var, value)

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