Split column at delimiter in data frame

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r dataframe column string split

I would like to split one column into two within at data frame based on a delimiter. For example,

a|b
b|c

to become

a    b
b    c

within a data frame.

Thanks!


@Taesung Shin is right, but then just some more magic to make it into a data.frame. I added a "x|y" line to avoid ambiguities:

df <- data.frame(ID=11:13, FOO=c('a|b','b|c','x|y'))
foo <- data.frame(do.call('rbind', strsplit(as.character(df$FOO),'|',fixed=TRUE)))

Or, if you want to replace the columns in the existing data.frame:

within(df, FOO<-data.frame(do.call('rbind', strsplit(as.character(FOO), '|', fixed=TRUE))))

Which produces:

  ID FOO.X1 FOO.X2
1 11      a      b
2 12      b      c
3 13      x      y

How to Split a Column into Two Columns in Pandas?, How do I split a column into two data frames? Split columns in dataframe with NA. Ask Question Asked 1 year, Split column at delimiter in data frame but it is not spliting the columns without repeating


The newly popular tidyr package does this with separate. It uses regular expressions so you'll have to escape the |

df <- data.frame(ID=11:13, FOO=c('a|b', 'b|c', 'x|y'))
separate(data = df, col = FOO, into = c("left", "right"), sep = "\\|")

  ID left right
1 11    a     b
2 12    b     c
3 13    x     y

though in this case the defaults are smart enough to work (it looks for non-alphanumeric characters to split on).

separate(data = df, col = FOO, into = c("left", "right"))

Data Tidying · Data Science with R, data. A data frame. col. Column name or position. This is passed to Separator between columns. If character, is If numeric, interpreted as positions to split at. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. Learn more How to split pandas column by a delimiter and select preferred element as the replacement


Hadley has a very elegant solution to do this inside data frames in his reshape package, using the function colsplit.

require(reshape)
> df <- data.frame(ID=11:13, FOO=c('a|b','b|c','x|y'))
> df
  ID FOO
1 11 a|b
2 12 b|c
3 13 x|y
> df = transform(df, FOO = colsplit(FOO, split = "\\|", names = c('a', 'b')))
> df
  ID FOO.a FOO.b
1 11     a     b
2 12     b     c
3 13     x     y

Separate a character column into multiple columns using a regular , Let us use separate function from tidyr to split the “file_name” column into multiple columns with specific column name. Here, we will specify the column names in a vector. By default, separate uses regular expression that matches any sequence of non-alphanumeric values as delimiter to split. Here is one approach using base R. It assumes we're starting with a data.frame named "mydf". It uses read.csv to read in the second column as a separate data.frame, which we combine with the first column from your source data. Finally, you use reshape to convert the data into a long form.


Just came across this question as it was linked in a recent question on SO.

Shameless plug of an answer: Use cSplit from my "splitstackshape" package:

df <- data.frame(ID=11:13, FOO=c('a|b','b|c','x|y'))
library(splitstackshape)
cSplit(df, "FOO", "|")
#   ID FOO_1 FOO_2
# 1 11     a     b
# 2 12     b     c
# 3 13     x     y

This particular function also handles splitting multiple columns, even if each column has a different delimiter:

df <- data.frame(ID=11:13, 
                 FOO=c('a|b','b|c','x|y'), 
                 BAR = c("A*B", "B*C", "C*D"))
cSplit(df, c("FOO", "BAR"), c("|", "*"))
#   ID FOO_1 FOO_2 BAR_1 BAR_2
# 1 11     a     b     A     B
# 2 12     b     c     B     C
# 3 13     x     y     C     D

Essentially, it's a fancy convenience wrapper for using read.table(text = some_character_vector, sep = some_sep) and binding that output to the original data.frame. In other words, another A base R approach could be:

df <- data.frame(ID=11:13, FOO=c('a|b','b|c','x|y'))
cbind(df, read.table(text = as.character(df$FOO), sep = "|"))
  ID FOO V1 V2
1 11 a|b  a  b
2 12 b|c  b  c
3 13 x|y  x  y

How to Split Text in a Column in Data Frame in R?, Often you may have a column in your pandas data frame and you may want By default, str.split uses a single space as delimiter and we can  Very often you may have to manipulate a column of text in a data frame with R. You may want to separate a column in to multiple columns in a data frame or you may want to split a column of text and keep only a part of it. tidyr’s separate function is the best option to separate a column or split a column of text the way you want.


strsplit(c('a|b','b|c'),'|',fixed=TRUE)

Split a text column into two columns in Pandas DataFrame , Use underscore as delimiter to split the column into two columns. filter_none. edit close. play_arrow. link brightness_4 code  Split a text column into two columns in Pandas DataFrame. Let’s see how to split a text column into two columns in Pandas DataFrame. Method #1 : Using Series.str.split() functions. Split Name column into two different columns. By default splitting is done on the basis of single space by str.split() function.


Python, Pandas provide a method to split string around a passed separator/delimiter. After that, the string can be new data frame with split value columns. data[ "​Team" ]  Often you may have a column in your pandas data frame and you may want to split the column and make it into two columns in the data frame. For example, one of the columns in your data frame is full name and you may want to split into first name and last name (like the figure shown below).


How to split a column in R, Here's my data frame. How can you combine columns to text in Excel? Generally, if you just want to split on a delimiter then you can just pass that character  Here's my data frame. &gt; data Manufacturers 1 Audi,RS5 2 BMW,M3 3 Cadillac,CTS-V 4 Lexus,ISF So I would want to split the manufacturers and the models, like this,


separate: Separate a character column into multiple columns using , data. A data frame. col. Column name or position. This is passed to tidyselect::​vars_pull() . Separator between columns. separate(x, c(NA, "B")) # If every row doesn't split into the same number of pieces, use # the extra and fill arguments to  If you want to split a string into more than two columns based on a delimiter you can omit the 'maximum splits' parameter. You can use: df['column_name'].str.split('/', expand=True) This will automatically create as many columns as the maximum number of fields included in any of your initial strings.