Re: [R] create a matrix with values from data.frame
Thanks Jim and David.. that was easy! Nic On 3/19/2011 3:00 PM, jim holtman wrote: x.mat<- matrix(NA, 95, 55) # create matrix x.mat[cbind(x$xloc, x$yloc)]<- x$totW which(!is.na(x.mat), arr.ind =TRUE) __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] create a matrix with values from data.frame
Here is one way to fill in the value using indexing; it appears that you data has the same xloc/yloc values > x xloc yloc go ind Ene totW 1 23 20 516 1 0.02 20.21 2 23 20 1143 1 0.02 20.21 3 23 20 250 1 0.02 20.21 4 22 15 251 1 0.02 18.69 5 22 15 598 1 0.02 18.69 6 21 19 250 1 0.02 20.21 7 22 20 251 1 0.02 18.69 8 22 20 598 1 0.02 18.69 > x.mat <- matrix(NA, 95, 55) # create matrix > x.mat[cbind(x$xloc, x$yloc)] <- x$totW > which(!is.na(x.mat), arr.ind =TRUE) row col [1,] 22 15 [2,] 21 19 [3,] 22 20 [4,] 23 20 > On Sat, Mar 19, 2011 at 5:29 PM, Nicolas Gutierrez wrote: > Hello, > > I'm trying to create a matrix (95x55) with data from a data.frame pop: > > xloc yloc go ind Ene totW > 1 23 20 516 1 0.02 20.21 > 2 23 20 1143 1 0.02 20.21 > 3 23 20 250 1 0.02 20.21 > 4 22 15 251 1 0.02 18.69 > 5 22 15 598 1 0.02 18.69 > 6 21 19 250 1 0.02 20.21 > 7 22 20 251 1 0.02 18.69 > 8 22 20 598 1 0.02 18.69 > > where xloc is the x dimension, yloc the y dimension, and totW the values > for each cell (xloc,yloc) in my matrix (55x95): > > I'm trying: > > Bio=with(pop, (table(factor(totW, levels = 1:55), factor(totW, levels = > 1:95 > > But I don't get what I want. Hints? Thanks! > > Nic > > __ > 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 Data Munger Guru 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] create a matrix with values from data.frame
On Mar 19, 2011, at 5:29 PM, Nicolas Gutierrez wrote: Hello, I'm trying to create a matrix (95x55) with data from a data.frame pop: xloc yloc go indEne totW 123 20 516 1 0.02 20.21 223 20 1143 1 0.02 20.21 323 20 250 1 0.02 20.21 422 15 251 1 0.02 18.69 522 15 598 1 0.02 18.69 621 19 250 1 0.02 20.21 722 20 251 1 0.02 18.69 822 20 598 1 0.02 18.69 where xloc is the x dimension, yloc the y dimension, and totW the values for each cell (xloc,yloc) in my matrix (55x95): I'm trying: Bio=with(pop, (table(factor(totW, levels = 1:55), factor(totW, levels = 1:95 You probably should be using `cut` rather than `factor`. (Both will create factor-class variables.) Factor will give you a different level at each unique value while it appears that you want integer valued "cuts". It's also unclear why you would be applying these cuts to totW twice You have three rows with identical (23,20) x,y coordinates and two each for (22,15) and (22,20), although the go values are different. But I don't get what I want. Hints? Thanks! Better advice might follow if you said what you were really trying to do and what the final answer should look like. Nic __ 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. David Winsemius, MD West Hartford, CT __ 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.
