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rbind: inconsistent behaviour with empty data frames?
3 messages · Dmitrii I., David L Carlson, Dmitrii Izgurskii
What version of R are you using? I cannot replicate your results with R 2.15.2:
df1 <- data.frame()
df2 <- data.frame(foo=c(1, 2), bar=c("a", "b"))
rbind(df1, df2)
foo bar 1 1 a 2 2 b
df1 <- data.frame(matrix(0, 0, 2)) names(df1) <- names(df2) rbind(df1, df2)
foo bar 1 1 a 2 2 b ---------------------------------------------- David L Carlson Associate Professor of Anthropology Texas A&M University College Station, TX 77843-4352
-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-
project.org] On Behalf Of Dmitrii I.
Sent: Wednesday, January 02, 2013 2:09 PM
To: r-help at r-project.org
Subject: [R] rbind: inconsistent behaviour with empty data frames?
The rbind on empty and nonempty data frames behaves inconsistently. I
am
not sure if by design.
In the first example, first row is deleted, which may or may not be on
purpose:
df1 <- data.frame()
df2 <- data.frame(foo=c(1, 2), bar=c("a", "b"))
rbind(df1, df2)
foo bar
2 2 b
Now if we continue:
df1 <- data.frame(matrix(0, 0, 2))
names(df1) <- names(df2)
foo bar
2 1 a
3 2 b
So now data frames combined successfully, but the row names have been
increased by one.
Finally, if row names are strings, it works okay:
row.names(df2) <- c("row1", "row2")
rbind(df1, df2)
foo bar
row1 1 a
row2 2 b
Is this behaviour by design?
[[alternative HTML version deleted]]
______________________________________________ R-help at r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting- guide.html and provide commented, minimal, self-contained, reproducible code.
What version of R are you using?
I am using version 2.15.1. Suddenly everything works correctly too. I guess a restarting R did the trick.
On 01/02/2013 10:25 PM, David L Carlson wrote:
What version of R are you using? I cannot replicate your results with R 2.15.2:
df1 <- data.frame()
df2 <- data.frame(foo=c(1, 2), bar=c("a", "b"))
rbind(df1, df2)
foo bar 1 1 a 2 2 b
df1 <- data.frame(matrix(0, 0, 2)) names(df1) <- names(df2) rbind(df1, df2)
foo bar 1 1 a 2 2 b ---------------------------------------------- David L Carlson Associate Professor of Anthropology Texas A&M University College Station, TX 77843-4352
-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-
project.org] On Behalf Of Dmitrii I.
Sent: Wednesday, January 02, 2013 2:09 PM
To: r-help at r-project.org
Subject: [R] rbind: inconsistent behaviour with empty data frames?
The rbind on empty and nonempty data frames behaves inconsistently. I
am
not sure if by design.
In the first example, first row is deleted, which may or may not be on
purpose:
df1 <- data.frame()
df2 <- data.frame(foo=c(1, 2), bar=c("a", "b"))
rbind(df1, df2)
foo bar
2 2 b
Now if we continue:
df1 <- data.frame(matrix(0, 0, 2))
names(df1) <- names(df2)
foo bar
2 1 a
3 2 b
So now data frames combined successfully, but the row names have been
increased by one.
Finally, if row names are strings, it works okay:
row.names(df2) <- c("row1", "row2")
rbind(df1, df2)
foo bar
row1 1 a
row2 2 b
Is this behaviour by design?
[[alternative HTML version deleted]]
______________________________________________ R-help at r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting- guide.html and provide commented, minimal, self-contained, reproducible code.