Re: [R] Re move row.names column in dataframe
Hi -Original Message- From: r-help-boun...@r-project.org [mailto:r-help-bounces@r- project.org] On Behalf Of jeharmse Sent: Monday, March 11, 2013 5:28 PM To: r-help@r-project.org Subject: Re: [R] Re move row.names column in dataframe 1.If your data frame is numeric, change it to matrix. It isn't necessarily numeric. 2.Or make your own function I think that's the solution, but the function has to handle both NA and non-numeric. equal.NA - function(x,y) all(is.na(x)==is.na(y)) all(is.na(x) | x==y) I'm still worried that row names could bite me in some other way, and would prefer to be able to discard them. As you did not include my answer I can not be 100% sure but for comparison purpose matrix way behaves correctly Regards Petr -- View this message in context: http://r.789695.n4.nabble.com/Remove-row- names-column-in-dataframe-tp856647p4660956.html Sent from the R help mailing list archive at Nabble.com. __ R-help@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. __ R-help@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.
Re: [R] Re move row.names column in dataframe
Thank you. This does what I want (apparently by coercing data.frame to list with no other structure). -- View this message in context: http://r.789695.n4.nabble.com/Remove-row-names-column-in-dataframe-tp856647p4661049.html Sent from the R help mailing list archive at Nabble.com. __ R-help@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.
Re: [R] Re move row.names column in dataframe
Hi -Original Message- From: r-help-boun...@r-project.org [mailto:r-help-bounces@r- project.org] On Behalf Of jeharmse Sent: Friday, March 08, 2013 7:41 PM To: r-help@r-project.org Subject: Re: [R] Re move row.names column in dataframe ... the row.names will not interfere with any merging operation ... Row names do not interfere with merge, but they cause other problems. In the example, I want to test whether rows have the same entries (in some or all columns). identical fails because of the row names, and all( == ) can fail if there are NAs. There are ways around this, but it would be cleaner to be able to remove row names. df - data.frame(x=c(1,1,NA,NA), y=c(2,2,7,7)) identical(df[1,],df[2,]) [1] FALSE all(df[1,]==df[2,]) [1] TRUE all(df[3,]==df[4,]) [1] NA I beg your pardon, whot does row names do with the above result? What do you expect as a result of all(df[3,]==df[4,]) Regards Petr -- View this message in context: http://r.789695.n4.nabble.com/Remove-row- names-column-in-dataframe-tp856647p4660743.html Sent from the R help mailing list archive at Nabble.com. __ R-help@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. __ R-help@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.
Re: [R] Re move row.names column in dataframe
identical(df[1,],df[2,]) is FALSE because of the row names. all( == ) is just a work-around that I attempted. Jorgen. On Mar 11, 2013, at 02:53 , PIKAL Petr wrote: df - data.frame(x=c(1,1,NA,NA), y=c(2,2,7,7)) identical(df[1,],df[2,]) [1] FALSE all(df[1,]==df[2,]) [1] TRUE all(df[3,]==df[4,]) [1] NA I beg your pardon, whot does row names do with the above result? What do you expect as a result of all(df[3,]==df[4,]) Regards Petr [[alternative HTML version deleted]] __ R-help@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.
Re: [R] Re move row.names column in dataframe
Hi
OK, I now got the point. You have several options
1.If your data frame is numeric, change it to matrix.
m-as.matrix(df)
m
x y
[1,] 1 2
[2,] 1 2
[3,] NA 7
[4,] NA 7
identical(m[1,],m[2,])
[1] TRUE
2.Or make your own function
nidentical- function(x,y) {
xn-as.numeric(x)
yn-as.numeric(y)
identical(xn,yn)}
nidentical(df[1,],df[2,])
[1] TRUE
which works for matrix too.
Both works also for factor variables and the second option issues warning when
dealing with character values. I did not tested it with other data types.
If you used as.character instead of as.numeric, the result will be probably
same (except the warning)
Regards
Petr
From: Jorgen Harmse [mailto:jorgen.har...@civitaslearning.com]
Sent: Monday, March 11, 2013 2:08 PM
To: PIKAL Petr
Cc: r-help@r-project.org
Subject: Re: [R] Re move row.names column in dataframe
identical(df[1,],df[2,]) is FALSE because of the row names. all( == ) is just a
work-around that I attempted.
Jorgen.
On Mar 11, 2013, at 02:53 , PIKAL Petr wrote:
df - data.frame(x=c(1,1,NA,NA), y=c(2,2,7,7))
identical(df[1,],df[2,])
[1] FALSE
all(df[1,]==df[2,])
[1] TRUE
all(df[3,]==df[4,])
[1] NA
I beg your pardon, whot does row names do with the above result? What do you
expect as a result of
all(df[3,]==df[4,])
Regards
Petr
[[alternative HTML version deleted]]
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Re: [R] Re move row.names column in dataframe
On 2013-03-11 06:07, Jorgen Harmse wrote: identical(df[1,],df[2,]) is FALSE because of the row names. all( == ) is just a work-around that I attempted. Jorgen. I would just wrap the elements in c(): identical( c(df[1,]), c(df[2,]) ) Peter Ehlers On Mar 11, 2013, at 02:53 , PIKAL Petr wrote: df - data.frame(x=c(1,1,NA,NA), y=c(2,2,7,7)) identical(df[1,],df[2,]) [1] FALSE all(df[1,]==df[2,]) [1] TRUE all(df[3,]==df[4,]) [1] NA I beg your pardon, whot does row names do with the above result? What do you expect as a result of all(df[3,]==df[4,]) Regards Petr [[alternative HTML version deleted]] __ R-help@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. __ R-help@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.
Re: [R] Re move row.names column in dataframe
1.If your data frame is numeric, change it to matrix. It isn't necessarily numeric. 2.Or make your own function I think that's the solution, but the function has to handle both NA and non-numeric. equal.NA - function(x,y) all(is.na(x)==is.na(y)) all(is.na(x) | x==y) I'm still worried that row names could bite me in some other way, and would prefer to be able to discard them. -- View this message in context: http://r.789695.n4.nabble.com/Remove-row-names-column-in-dataframe-tp856647p4660956.html Sent from the R help mailing list archive at Nabble.com. __ R-help@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.
Re: [R] Re move row.names column in dataframe
... the row.names will not interfere with any merging operation ... Row names do not interfere with merge, but they cause other problems. In the example, I want to test whether rows have the same entries (in some or all columns). identical fails because of the row names, and all( == ) can fail if there are NAs. There are ways around this, but it would be cleaner to be able to remove row names. df - data.frame(x=c(1,1,NA,NA), y=c(2,2,7,7)) identical(df[1,],df[2,]) [1] FALSE all(df[1,]==df[2,]) [1] TRUE all(df[3,]==df[4,]) [1] NA -- View this message in context: http://r.789695.n4.nabble.com/Remove-row-names-column-in-dataframe-tp856647p4660743.html Sent from the R help mailing list archive at Nabble.com. __ R-help@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.
[R] Re move row.names column in dataframe
Hello, aa-c(1,1,2,2,3,3,4,4,5,5,6,6) bb-c(56,56,33,33,53,53,20,20,63,63,9,9) cc-data.frame(aa,bb) uniquedf - unique(cc) View(uniquedf) Why does the column row.names appear in the new dataframe and how do I get rid of it. uniquedf$row.names - NULL does not seem to work. For what I'm doing this is a useless column and can cause confusion and/or problems for subsequent merging/filtering etc. Thanks. -- View this message in context: http://www.nabble.com/Remove-row.names-column-in-dataframe-tp18050179p18050179.html Sent from the R help mailing list archive at Nabble.com. __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Re move row.names column in dataframe
- There is no column in the data frame called row.names. It only looks that way when you use the viewer. - All data frames must have row and column names. This is not negotiable. Also, the row.names will not interfere with any merging operation because they are not a column of the data frame: they are the row names. Bill Venables CSIRO Laboratories mailto:[EMAIL PROTECTED] http://www.cmis.csiro.au/bill.venables/ -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of tonyxv Sent: Sunday, 22 June 2008 11:15 AM To: r-help@r-project.org Subject: [R] Re move row.names column in dataframe Hello, aa-c(1,1,2,2,3,3,4,4,5,5,6,6) bb-c(56,56,33,33,53,53,20,20,63,63,9,9) cc-data.frame(aa,bb) uniquedf - unique(cc) View(uniquedf) Why does the column row.names appear in the new dataframe and how do I get rid of it. uniquedf$row.names - NULL does not seem to work. For what I'm doing this is a useless column and can cause confusion and/or problems for subsequent merging/filtering etc. Thanks. -- View this message in context: http://www.nabble.com/Remove-row.names-column-in-dataframe-tp18050179p18 050179.html Sent from the R help mailing list archive at Nabble.com. __ R-help@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. __ R-help@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.
Re: [R] Re move row.names column in dataframe
tonyxv wrote: Hello, aa-c(1,1,2,2,3,3,4,4,5,5,6,6) bb-c(56,56,33,33,53,53,20,20,63,63,9,9) cc-data.frame(aa,bb) uniquedf - unique(cc) View(uniquedf) Why does the column row.names appear in the new dataframe and how do I get rid of it. uniquedf$row.names - NULL does not seem to work. For what I'm doing this is a useless column and can cause confusion and/or problems for subsequent merging/filtering etc. Thanks. There is no column row.names; there are only row names. In R enter ?unique ?View ?row.names ?data.frame and your questions will be answered. To get sequential row numbers you can do row.names(uniquedf) - NULL Berend -- View this message in context: http://www.nabble.com/Remove-row.names-column-in-dataframe-tp18050179p18051448.html Sent from the R help mailing list archive at Nabble.com. __ R-help@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.
