Question

I have a df :

Years Company ID    Name    Return
2003    23  622009  a       2323123
2008    14  622008  v       2312343
2009    43  622007  c       35345345
2006    32  622006  d       45656554
2005    67  622005  f       756756766
1999    60  622004  y       4564533
2001    63  622003  i       6756766
2002    66  622002  m       32423412
2008    68  622001  o       934833833
2004    48  622000  e       34132222

I am trying to rearrange the ordering of the Years column in ascending order (so the most recent year (2009) is on the top). In example :

Years Company ID    Name    Return
2009    62  622007  c       35345345
2008    62  622008  v       2312343 
2008    62  622001  o       934833833 
2006    62  622006  d       45656554
2005    62  622005  f       756756766

and so on…

I tried to do it with a for loop but it gives an incorrect answer. I get only the last row :

2005    62  622005  f       756756766

for (i in 1:length(unique(df$Year))){
  mm<-df[df$Year==unique(df$Year)[i],]
}

Could someone please guide me what I am doing wrong?

Answer 1

Use order function for that:

df[order(df$Years,decreasing=TRUE), ]