[R] split & rbind (cast) dataframe

arun smartpink111 at yahoo.com
Fri Jan 11 18:51:18 CET 2013

May be this also works for you:
 do.call(cbind,by(df1[,-1],df1[,1],function(x) x))
 # A.col2 A.col3 B.col2 B.col3
#1      1      1      3      3
#2      2      2      4      4

----- Original Message -----
From: Johannes Radinger <johannesradinger at gmail.com>
To: r-help at r-project.org
Sent: Friday, January 11, 2013 7:46 AM
Subject: [R] split & rbind (cast) dataframe


I would like to split dataframe based on one colum and want
to connect the two dataframes by rows (like rbind). Here a small example:

# The orgininal dataframe
df1 <- data.frame(col1 = c("A","A","B","B"),col2 = c(1:4), col3 = c(1:4))

# The datafame how it could look like
df2 <- data.frame(A.col2 = c(1,2), A.col3 = c(1,2), B.col2 = c(3,4),
B.col3 = c(3,4))

I think I already did a similar procedure sometime ago with the
cast() command from reshape-package but I cant remember correctly...
...maybe someone can point me to the correct formula...



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