Search Archives

I am learning to use R using a book that uses examples from the ISwR library so I need to have that library. When I type library (ISwR), R says: Error in library(ISwR) : there is no package called 'ISwR...

Hi R-community, I am doing a PCA and I need plots for different combinations of axes (e.g., PC1 vs PC3, and PC2 vs PC3) with the arrows indicating the loadings of each variables. What I need is exactly...

Hi all, I am trying to plot the results of a discriminant analysis done with lda(MASS) but my groups appear in two different plots (in the same graphics device) and I want to combine them in one plot. My...

Hi all, Can anyone please tell me how to start R from Tinn-R's "Toogle start/close Rgui" button, after I've updated to a new version of R? It seems like Tinn-R keeps looking for the previous...

Dear all, I did a Kruskall-Wallis test for a comparison of a variable of interest between 10 sites and I get a significant result (p=0.0019). however, when I perform a post-hoc test using kruskalmc from the...

I am trying to get a random matrix based on an original matrix called disperser.mx, with dimensions 30x73 When I write the following code: >scramble = sample (disperser.mx) >newmat = matrix(scramble, nrow=30) I get the following warning message...

> refdata = > read.table("K:\\MerchantData\\RiskModel\\refund_distribution.csv", header > = TRUE) Error in scan(file, what, nmax, sep, dec, quote, skip, nlines, na.strings, : line 1 did not have 42 elements > refdata = > read.table("K:\\MerchantData\\RiskModel\\refund_distribution.csv...

Hi, I am trying to do a PCA on my data but I keep getting the error message svd(x, nu=0) infinite or missing values >From the messages posted on the subject, I understand that the NAs in my...

>Error in isoMDS(Gquad.dist) : zero or negative distance between objects >179 and 180. >How can I handle this, is it valid to add 0.5 to every element in the >distance matrix or is someother alternative more appropriate? This...

I work with Windows and use R version 2.4.1. I am JUST starting to learn this program... I get this warning message 'NAs introduced by coercion' while trying to build a distance matrix (to be analyzed with NMDS...

I use Windows, R version 2.4.1. I have a dataset in which columns 1-3 are replicates, 4-6, are replicates, etc. I need to calculate an average for every set of replicates (columns 1-3, 4-6...

I work on Windows, R version 2.4.1 I need to leave out many rows and columns when reading a matrix. The 'skip' commands in read.table, seem to be just for skipping rows, if I understand well, but...

I work with Windows, R version 2.4.1 I'm trying to do a discriminant analysis and, in trying to figure out how to do it following the example from R help, I'm getting an error that says...

I use Widows, R version 2.4.1 I have 4 questions on lda (MASS) (code is pasted below): 1st. How can I obtain the statistics and p-value associated with discriminant analysis? Am I supposed to calculate that manually...

Thanks! That worked. Silvia. Bos, Roger wrote: > > Silvia, > > Option / Main / Application then click on the 'R' tab. At the bottom of > the window you can browse to the new location. > > HTH, Roger > > -----Original Message----- > From: r-help-bounces at r...

I need to sample a matrix according to different distributions, instead of just randomly. Here is some code that will hopefully clarify what I need: I have a matrix M of 1287 interactions between species in rows and species in...

michael watson (IAH-C) wrote: > > Check out rowMeans to average over replicate columns first, ie: > > means <- data.frame(t1=rowMeans(a[,1:3]), > t2=rowMeans(a[,4:6]), > etc) > > Then, if you want to aggregate every 14 rows: > > aggregate(means...

yes, this works. It didn't think of concatenating... thanks! jim holtman wrote: > > zzz <- zzz[-c(1,45,23,321), -c(23,34,45,67)] > > > On 5/8/07, Silvia Lomascolo <slomascolo at zoo.ufl.edu> wrote: >> >> I work on...

Hi R community, I am trying to obtain a sample from a matrix but sample(my.matrix) doesn't do what I need. I have a matrix of 1287 interactions between the species in columns and the species in rows...

Greg Snow-2 wrote: > > The sample function has a prob argument that can be used to sample with > unequal probabilities. It sounds like you can just pass in the species > abundance vector to prob and it will do what you...