[R] Creating named.list from two matrix columns
Hi Friends, I am new to R. On R utility class pages, creating named.list is described with this command : new(named.list,a=1,b=2) For large matrix having two columns, such as : row1 2334 row2 347 row3 379 ... I want to create a named.list like : $row1 [1] 2334 $row2 [1] 347 ... Can anyone explain how named.list variable can be created by using two specified columns of a dataframe or matrix object, where one of the two columns is assigned as a name (string) and other as its corresponding value ? Thanks [[alternative HTML version deleted]] __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Creating named.list from two matrix columns
Is this what you want: x V1 V2 1 row1 2334 2 row2 347 3 row3 379 x.list - as.list(x$V2) names(x.list) - x$V1 x.list $row1 [1] 2334 $row2 [1] 347 $row3 [1] 379 On Mon, Sep 6, 2010 at 7:55 AM, Viki S is...@live.com wrote: Hi Friends, I am new to R. On R utility class pages, creating named.list is described with this command : new(named.list,a=1,b=2) For large matrix having two columns, such as : row1 2334 row2 347 row3 379 ... I want to create a named.list like : $row1 [1] 2334 $row2 [1] 347 ... Can anyone explain how named.list variable can be created by using two specified columns of a dataframe or matrix object, where one of the two columns is assigned as a name (string) and other as its corresponding value ? Thanks [[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. -- Jim Holtman Cincinnati, OH +1 513 646 9390 What is the problem that you are trying to solve? __ 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] Creating named.list from two matrix columns
Hi Jim, Thanks, That´s right. But the problem is that it introduces unnecessary quotes, perhaps due to the format of first column data in this case : x-cbind(c(row:1, row:2, row:3), c(4889, 9987, 494)) x1-as.list(x[,2]) names(x1)-x[,1] x1 $`row:1` [1] 4889 $`row:2` [1] 9987 $`row:3` [1] 494 How can I avoid unnecessary ` `quotes around the names ? V Date: Mon, 6 Sep 2010 09:14:23 -0400 Subject: Re: [R] Creating named.list from two matrix columns From: jholt...@gmail.com To: is...@live.com CC: r-help@r-project.org Is this what you want: x V1 V2 1 row1 2334 2 row2 347 3 row3 379 x.list - as.list(x$V2) names(x.list) - x$V1 x.list $row1 [1] 2334 $row2 [1] 347 $row3 [1] 379 On Mon, Sep 6, 2010 at 7:55 AM, Viki S is...@live.com wrote: Hi Friends, I am new to R. On R utility class pages, creating named.list is described with this command : new(named.list,a=1,b=2) For large matrix having two columns, such as : row1 2334 row2 347 row3 379 ... I want to create a named.list like : $row1 [1] 2334 $row2 [1] 347 ... Can anyone explain how named.list variable can be created by using two specified columns of a dataframe or matrix object, where one of the two columns is assigned as a name (string) and other as its corresponding value ? Thanks [[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. -- Jim Holtman Cincinnati, OH +1 513 646 9390 What is the problem that you are trying to solve? [[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] Creating named.list from two matrix columns
The quotes are not unnecessary since 'row:1' is not a valid name and therefore you will need quotes to refer to the data: x-cbind(c(row:1, row:2, row:3), c(4889, 9987, 494)) x1-as.list(x[,2]) names(x1)-x[,1] x1 $`row:1` [1] 4889 $`row:2` [1] 9987 $`row:3` [1] 494 str(x1) List of 3 $ row:1: chr 4889 $ row:2: chr 9987 $ row:3: chr 494 x1$row:1 # causes an error Error in x1$row:1 : argument of length 0 No suitable frames for recover() x1$'row:1' # now you can access the value [1] 4889 x1[['row:1']] # another way of accessing it with a character string [1] 4889 On Mon, Sep 6, 2010 at 12:29 PM, Viki S is...@live.com wrote: Hi Jim, Thanks, That´s right. But the problem is that it introduces unnecessary quotes, perhaps due to the format of first column data in this case : x-cbind(c(row:1, row:2, row:3), c(4889, 9987, 494)) x1-as.list(x[,2]) names(x1)-x[,1] x1 $`row:1` [1] 4889 $`row:2` [1] 9987 $`row:3` [1] 494 How can I avoid unnecessary ` `quotes around the names ? V Date: Mon, 6 Sep 2010 09:14:23 -0400 Subject: Re: [R] Creating named.list from two matrix columns From: jholt...@gmail.com To: is...@live.com CC: r-help@r-project.org Is this what you want: x V1 V2 1 row1 2334 2 row2 347 3 row3 379 x.list - as.list(x$V2) names(x.list) - x$V1 x.list $row1 [1] 2334 $row2 [1] 347 $row3 [1] 379 On Mon, Sep 6, 2010 at 7:55 AM, Viki S is...@live.com wrote: Hi Friends, I am new to R. On R utility class pages, creating named.list is described with this command : new(named.list,a=1,b=2) For large matrix having two columns, such as : row1 2334 row2 347 row3 379 ... I want to create a named.list like : $row1 [1] 2334 $row2 [1] 347 ... Can anyone explain how named.list variable can be created by using two specified columns of a dataframe or matrix object, where one of the two columns is assigned as a name (string) and other as its corresponding value ? Thanks [[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. -- Jim Holtman Cincinnati, OH +1 513 646 9390 What is the problem that you are trying to solve? -- Jim Holtman Cincinnati, OH +1 513 646 9390 What is the problem that you are trying to solve? __ 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] Creating named.list from two matrix columns
Hi: See inline. On Mon, Sep 6, 2010 at 9:29 AM, Viki S is...@live.com wrote: Hi Jim, Thanks, Thatæ right. But the problem is that it introduces unnecessary quotes, perhaps due to the format of first column data in this case : x-cbind(c(row:1, row:2, row:3), c(4889, 9987, 494)) x1-as.list(x[,2]) names(x1)-x[,1] x1 $`row:1` [1] 4889 $`row:2` [1] 9987 $`row:3` [1] 494 How can I avoid unnecessary ` `quotes around the names ? Short answer: don't put special characters in your names. In R, : is a binary operator (sequencing). Moreover, use data frames when you have variables of mixed type rather than matrices. Compare the following: d - data.frame(nm = c(row:1, row:2, row:3), + val = c(4889, 9987, 494)) d nm val 1 row:1 4889 2 row:2 9987 3 row:3 494 l - as.list(d[, 2]) names(l) - d$nm l $`row:1` [1] 4889 $`row:2` [1] 9987 $`row:3` [1] 494 d - data.frame(nm = c(row1, row2, row3), + val = c(4889, 9987, 494)) l - as.list(d[, 2]) names(l) - d$nm l $row1 [1] 4889 $row2 [1] 9987 $row3 [1] 494 HTH, Dennis V Date: Mon, 6 Sep 2010 09:14:23 -0400 Subject: Re: [R] Creating named.list from two matrix columns From: jholt...@gmail.com To: is...@live.com CC: r-help@r-project.org Is this what you want: x V1 V2 1 row1 2334 2 row2 347 3 row3 379 x.list - as.list(x$V2) names(x.list) - x$V1 x.list $row1 [1] 2334 $row2 [1] 347 $row3 [1] 379 On Mon, Sep 6, 2010 at 7:55 AM, Viki S is...@live.com wrote: Hi Friends, I am new to R. On R utility class pages, creating named.list is described with this command : new(named.list,a=1,b=2) For large matrix having two columns, such as : row1 2334 row2 347 row3 379 ... I want to create a named.list like : $row1 [1] 2334 $row2 [1] 347 ... Can anyone explain how named.list variable can be created by using two specified columns of a dataframe or matrix object, where one of the two columns is assigned as a name (string) and other as its corresponding value ? Thanks [[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. -- Jim Holtman Cincinnati, OH +1 513 646 9390 What is the problem that you are trying to solve? [[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. [[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.
