I would like to sort a data frame by alphabetic order of a character variable in R. I've tried to do it with the order() function but it transforms my data frame into a list. Does anyone has a clue ?
This question is related to
r
The order() function fails when the column has levels or factor. It works properly when stringsAsFactors=FALSE is used in data.frame creation.
The arrange
function in the plyr
package makes it easy to sort by multiple columns. For example, to sort DF
by ID
first and then decreasing by num
, you can write
plyr::arrange(DF, ID, desc(num))
This really belongs with @Ramnath's answer but I can't comment as I don't have enough reputation yet. You can also use the arrange
function from the dplyr
package in the same way as the plyr
package.
library(dplyr)
arrange(DF, ID, desc(num))
Use order
function:
set.seed(1)
DF <- data.frame(ID= sample(letters[1:26], 15, TRUE),
num = sample(1:100, 15, TRUE),
random = rnorm(15),
stringsAsFactors=FALSE)
DF[order(DF[,'ID']), ]
ID num random
10 b 27 0.61982575
12 e 2 -0.15579551
5 f 78 0.59390132
11 f 39 -0.05612874
1 g 50 -0.04493361
2 j 72 -0.01619026
14 j 87 -0.47815006
3 o 100 0.94383621
9 q 13 -1.98935170
8 r 66 0.07456498
13 r 39 -1.47075238
15 u 35 0.41794156
4 x 39 0.82122120
6 x 94 0.91897737
7 y 22 0.78213630
Another solution would be using orderBy
function from doBy package:
> library(doBy)
> orderBy(~ID, DF)
#sort dataframe by col
sort.df <- with(df, df[order(sortbythiscolumn) , ])
#can also sort by more than one variable: sort by col1 and then by col2
sort2.df <- with(df, df[order(col1, col2) , ])
#sort in reverse order
sort2.df <- with(df, df[order(col1, -col2) , ])
Source: Stackoverflow.com