[R] simple question: reading lower triangular matrix
Dear list, I will like to learn how to read a lower triangular matrix in R. The input file *.txt have the following format: A B C D E A 0 B 10 C 250 D 3680 E 479 100 How this can be done? Thanks in advance for your help Rogério __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
Re: [R] simple question: reading lower triangular matrix
On Tue, 2005-07-12 at 14:37 -0300, Rogério Rosa da Silva wrote: Dear list, I will like to learn how to read a lower triangular matrix in R. The input file *.txt have the following format: A B C D E A 0 B 10 C 250 D 3680 E 479 100 How this can be done? Thanks in advance for your help Rogério I don't know that this is the easiest way of doing it, but here is one approach: # I saved your data above in a file called test.txt # Read the first line of test.txt to get the colnames as chars col.names - unlist(read.table(test.txt, nrow = 1, as.is = TRUE)) # now read the rest of the file using 'fill = TRUE' to pad lines # with NAs # skip the first line # set the row.names as the first column in the text file # coerce to a matrix df - as.matrix(read.table(test.txt, fill = TRUE, skip = 1, row.names = 1)) # Now set the colnames of df colnames(df) - col.names df A B C D E A 0 NA NA NA NA B 1 0 NA NA NA C 2 5 0 NA NA D 3 6 8 0 NA E 4 7 9 10 0 If you should further want to set the diagonal to NA: diag(df) - NA df A B C D E A NA NA NA NA NA B 1 NA NA NA NA C 2 5 NA NA NA D 3 6 8 NA NA E 4 7 9 10 NA See ?read.table for more information on the file reading part. HTH, Marc Schwartz __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
Re: [R] simple question: reading lower triangular matrix
This has been answered at the following URL http://tolstoy.newcastle.edu.au/~rking/R/help/04/11/6695.html On Tue, 2005-07-12 at 14:37 -0300, Rogério Rosa da Silva wrote: Dear list, I will like to learn how to read a lower triangular matrix in R. The input file *.txt have the following format: A B C D E A 0 B 10 C 250 D 3680 E 479 100 How this can be done? Thanks in advance for your help Rogério __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
Re: [R] simple question: reading lower triangular matrix
Dear Adaikalavan and Marc, Thanks for advices. The answer in R-help archives is exactly what I'm needing. Best regards, Rogério Adaikalavan Ramasamy wrote: This has been answered at the following URL http://tolstoy.newcastle.edu.au/~rking/R/help/04/11/6695.html On Tue, 2005-07-12 at 14:37 -0300, Rogério Rosa da Silva wrote: __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
