Re: [R] how to rearrange a dataframe
On Feb 23, 2010, at 4:27 PM, Laura Rodriguez Murillo wrote: Hi all, I'd appreciate if anyone can help me with this... I have a data frame that looks like this: 1 + name1 1 2 3 2 + name2 5 9 10 2 - name3 56 74 93 1 - name4 65 75 98 I need to rearrange this in a way so that the rows with 1 in the first column, and - in the second column; then columns 4 and 6 should switch places. That is, column 6 would be now column 4 and column 4 would be column 6 (column 5 should stay as column 5) In the same way, if the first column is 2 and the second is +, then the same rearrangement should be done. Rows with the first two entries 1 + or 2 - should stay in the same order. This should be done for each row independently. Seems as though there should be a swap function or a fancy indexing solution that would do this but I am not coming up with anything particularly terse. Here is a beginning. You could assign these vectors to new columns (perhaps after (re-)making them numeric ) and delete the old columns if you needed to. Say your dataframe were called ta: apply(ta, 1, function(x) ifelse( (x[1]==1 x[2]==-)|(x[1]==2 x[2]==+), c(x[6],x[4]), c(x[4],x[6]) )) [1] 1 10 56 98 apply(ta, 1, function(x) ifelse( (x[1]==1 x[2]==-)|(x[1]==2 x[2]==+), c(x[4],x[6]) , c(x[6],x[4]))) [1] 3 5 93 65 -- David. Thanks a lot for your help! __ 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] how to rearrange a dataframe
Try this: a - b - read.table(textConnection( 1 + name1 1 2 3 2 + name2 5 9 10 2 - name3 56 74 93 1 - name4 65 75 98), skip=1, header=FALSE) swapidx - with(a, (V1 == 2 V2 == +) | (V1 == 1 V2 == -)) b[swapidx,] - b[swapidx, c(1:3,6:4)] This creates an indexing vector that identifies which rows to swap, then the 6:4 flips around the fourth through sixth columns. - Tom On Tue, Feb 23, 2010 at 5:27 PM, Laura Rodriguez Murillo laura.lmuri...@gmail.com wrote: Hi all, I'd appreciate if anyone can help me with this... I have a data frame that looks like this: 1 + name1 1 2 3 2 + name2 5 9 10 2 - name3 56 74 93 1 - name4 65 75 98 I need to rearrange this in a way so that the rows with 1 in the first column, and - in the second column; then columns 4 and 6 should switch places. That is, column 6 would be now column 4 and column 4 would be column 6 (column 5 should stay as column 5) In the same way, if the first column is 2 and the second is +, then the same rearrangement should be done. Rows with the first two entries 1 + or 2 - should stay in the same order. This should be done for each row independently. Thanks a lot for your help! __ 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] how to rearrange a dataframe
Tena koe Laura temp - yourData[(yourData[,1]==1 yourData[,2]=='-') | (yourData[,1]==2 yourData[,2]=='+'),6] Then use similar subsetting to put column 4 into 6, and then temp into column 4. If you don't want to use the intermediary temp then you can use the construct a - a+b b - a-b a - a-b HTH Peter Alspach -Original Message- From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On Behalf Of Laura Rodriguez Murillo Sent: Wednesday, 24 February 2010 11:28 a.m. To: r-help@r-project.org Subject: [R] how to rearrange a dataframe Hi all, I'd appreciate if anyone can help me with this... I have a data frame that looks like this: 1 + name1 1 2 3 2 + name2 5 9 10 2 - name3 56 74 93 1 - name4 65 75 98 I need to rearrange this in a way so that the rows with 1 in the first column, and - in the second column; then columns 4 and 6 should switch places. That is, column 6 would be now column 4 and column 4 would be column 6 (column 5 should stay as column 5) In the same way, if the first column is 2 and the second is +, then the same rearrangement should be done. Rows with the first two entries 1 + or 2 - should stay in the same order. This should be done for each row independently. Thanks a lot for your help! __ 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.
