Re: [R] subset in a matrix

Try this: z[z[,1] 0,] On Tue, Feb 9, 2010 at 6:12 PM, DonDiego jorge.nie...@moorecap.com wrote: Hi, I have a matrix of data values like the example bellow. I would like to extract a subset of the matrix for the values where the first column is negative.  I am using the subset function.

Re: [R] subset in a matrix

Hi: z = matrix(rnorm(n*m),n,m,dimnames =list(rnames,cnames)) z x1 x2 x3 x4 x5 1 -0.3942900 -0.61202639 -1.804958629 -0.1351786 -1.27659221 2 -0.0593134 0.34111969 1.465554862 1.1780870 -0.57326541 3 1.1000254 -1.12936310 0.153253338

Re: [R] subset in a matrix

As others have said, z[z[, 1] 0, ] does it. Just in case you're wondering why your subset command won't work, str() is your friend (as is so often the case): str(z) str(as.data.frame(z)) ## (I don't think that R has 'as.data.set') So z is a matrix with column *names* x1, etc; as.data.frame(z)

Re: [R] subset of a matrix

Hi Carlos, how about this step first: rownames(mydata)-gsub(361a,00361a,rownames(mydata)) rownames(mydata)-gsub(456a,00456a,rownames(mydata)) good luck milton On Thu, Aug 27, 2009 at 12:27 PM, Carlos Gonzalo Merino Mendez carlosgmer...@yahoo.com wrote: Hello everyone, I would appreciate any

Re: [R] subset of a matrix

Hi Carlos, I think I made a wrong suggestion. Sorry about that. I was thinking that if you have the same rowname length it helps you on the data handling. Is it true?! Case yes I can try suggest another automatic way of you get it. bests milton On Thu, Aug 27, 2009 at 12:39 PM, milton ruser

Re: [R] subset of a matrix

Try this: lapply(data, function(r) lapply(split(r, substr(sprintf(%05d, as.numeric(gsub([a-z], , row.names(r, 1, 3)), table)) On Thu, Aug 27, 2009 at 1:27 PM, Carlos Gonzalo Merino Mendez carlosgmer...@yahoo.com wrote: Hello everyone, I would

Re: [R] subset of a matrix

Hi Milton, Thanks for trying to help anyway. From: milton ruser milton.ru...@gmail.com Cc: r-help@r-project.org Sent: Thursday, August 27, 2009 6:48:41 PM Subject: Re: [R] subset of a matrix Hi Carlos, I think I made a wrong suggestion. Sorry about

Re: [R] subset of a matrix

script? Can you explain what for are you using those commands? Thanks for the help anyway. Cheers, Carlos From: Henrique Dallazuanna www...@gmail.com Cc: r-help@r-project.org Sent: Thursday, August 27, 2009 7:00:45 PM Subject: Re: [R] subset of a matrix Try