[R] Retrieving matrix column and row names by index value

Hi all, So let's say I have a matrix, mdat and I only know the index number. How do I retrieve the column and row names? For example, mdat - matrix(c(1,2,3, 11,12,13), nrow = 2, ncol=3, byrow=TRUE, dimnames = list(c(row1, row2), c(C.1, C.2, C.3)))

[R] adjusting levelplot color scale to data

Hi guys, I have a matrix with values varying from approximately -0.7 to 0.33 that I want to create a heatmap/levelplot with. When I execute the levelplot function for my matrix, I end up getting colors that are adjusted to the max and min rather than around 0. In other words, ideally I would

[R] Interactive R Learning Website

/monitor/stats/sandbox Thanks! Lanna Jin - Lanna Jin lanna...@gmail.com 510-898-8525 -- View this message in context: http://r.789695.n4.nabble.com/Interactive-R-Learning-Website-tp2263270p2263270.html Sent from the R help mailing list archive at Nabble.com

Re: [R] How to replace all NA values in a data.frame with another ( not 0) value

Try: x[which(is.na(x)),] - 000/000, where is x is your data frame - Lanna Jin lanna...@gmail.com 510-898-8525 -- View this message in context: http://r.789695.n4.nabble.com/How-to-replace-all-NA-values-in-a-data-frame-with-another-not-0-value-tp2125458p2125464.html Sent from the R help

Re: [R] How to replace all NA values in a data.frame with another ( not 0) value

Whoops, my bad. Maybe try using gsub - Lanna Jin lanna...@gmail.com 510-898-8525 -- View this message in context: http://r.789695.n4.nabble.com/How-to-replace-all-NA-values-in-a-data-frame-with-another-not-0-value-tp2125458p2125471.html Sent from the R help mailing list archive

[R] R for web browser

Hi Everyone, Does anyone know of any projects for running an interactive R session within a web browser? I'm looking for something similar to the one on the Ruby website (http://tryruby.org), except for R. Thanks for your responses in advance! Lanna - Lanna Jin lanna...@gmail.com 510-898

Re: [R] Delete rows with duplicate field...

Try, unique(dataset[,1:a]), where a is the number of columns that you have. 1:a would apply the unique to all columns. - Lanna Jin lanna...@gmail.com 510-898-8525 -- View this message in context: http://r.789695.n4.nabble.com/Delete-rows-with-duplicate-field-tp2123939p2123976.html Sent

Re: [R] Delete rows with duplicate field...

Did you try: if x is the data frame, unique(x)? - Lanna Jin lanna...@gmail.com 510-898-8525 -- View this message in context: http://r.789695.n4.nabble.com/Delete-rows-with-duplicate-field-tp2123939p2123956.html Sent from the R help mailing list archive at Nabble.com

Re: [R] Delete rows with duplicate field...

if that doesn't work, maybe also try: if x is your data frame with length a columns, unique(x[,1:a]). - Lanna Jin lanna...@gmail.com 510-898-8525 -- View this message in context: http://r.789695.n4.nabble.com/Delete-rows-with-duplicate-field-tp2123939p2123964.html Sent from the R help

Re: [R] Delete rows with duplicate field...

names() - Lanna Jin lanna...@gmail.com 510-898-8525 -- View this message in context: http://r.789695.n4.nabble.com/Delete-rows-with-duplicate-field-tp2123939p2124036.html Sent from the R help mailing list archive at Nabble.com. __ R-help@r

Re: [R] Dynamische Programmierung mit R

Weiss ich nicht genau ob es in R gibt, aber versuch mal Processing.org - Lanna Jin lanna...@gmail.com 510-898-8525 -- View this message in context: http://r.789695.n4.nabble.com/Dynamische-Programmierung-mit-R-tp2076695p2076909.html Sent from the R help mailing list archive at Nabble.com

Re: [R] short question about data frame manipulation

df[1:2]-df[1:2]*-1 - Lanna Jin lanna...@gmail.com 510-898-8525 -- View this message in context: http://r.789695.n4.nabble.com/short-question-about-data-frame-manipulation-tp2076891p2076899.html Sent from the R help mailing list archive at Nabble.com

[R] nested looping functions and dataframes

successful in answering my question. As a new user to R and programming languages, I truly appreciate your help and thank you for your patience. Thanks in advance for your response, Lanna Jin - Lanna Jin lanna...@gmail.com 510-898-8525 -- View this message in context: http://n4.nabble.com

Re: [R] nested looping functions and dataframes

spec...@stat.berkeley.edu On Tue, 16 Mar 2010, Lanna Jin wrote: Hey All, So, I am confused how exactly to use nesting loop functions in R to spit out data frames. I've managed to create a working function for my data set that generates a data frame for a given set

[R] Fwd: function to create multiple matrices

, length) On Thu, Mar 11, 2010 at 10:55 AM, Lanna Jin lanna...@gmail.comwrote: Hi Jim, Here's an example of what I mean by a binary matrix ( 1 = species presence, 0 = species absence, cols = species, rows = location). This is just a sample of data from the Year 1998 ACMI2

[R] function to create multiple matrices

for your suggestions! -- Lanna Jin lanna...@gmail.com 510-898-8525 [[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

[R] Graphics Question

! -- Lanna Jin lanna...@gmail.com 510-898-8525 [[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

[R] zeros keep dropping

Hello All! I am trying to plot the frequency of species coocurrance. If given a data set similar like this...(V1=species A, V2=species B, V3=frequency of cooccurance) data V1 V2 V3 1 A B 0 2 A C 2 3 A D 5 4 B C 0 5 B D 1 6 C D 0