similar to: What is behind class coercion of a factor into a character

Hello dear all, I am unable to understand why when I run the following three lines: set.seed(4254) > a <- data.frame(y = rnorm(40), x=ordered(sample(1:5, 40, T))) > summary(lm(y ~ x, a)) The output I get includes factor levels which are not relevant to what I am actually using: Call: > lm(formula = y ~ x, data = a) > Residuals: > Min 1Q Median 3Q Max >

Suppose I have two data frames A and B A has three variables and B also has three variables. I would like to merge these two database but the requirement to merge is that the value of the second column in database A is less than the value of the second column in database B. Is there a R code to do this? Thanks Dataframe A: V1a V2a V3a 1 2 3 5

How do I concatenate two vectors of factors? --8<---------------cut here---------------start------------->8--- > a <- factor(5:1,levels=1:9) > b <- factor(9:1,levels=1:9) > str(c(a,b)) int [1:14] 5 4 3 2 1 9 8 7 6 5 ... > str(unlist(list(a,b),use.names=FALSE)) Factor w/ 9 levels "1","2","3","4",..: 5 4 3 2 1 9 8 7 6 5 ...

Hi all, Let's say I have a data.frame and wants to turn each of it's columns into a factor. My instinct would be to use as.factor with apply. But this won't work, and result with a data.frame of characters. I found another solution for how to achieve this, but I would also like to understand - *WHY* does it work this way? Here is an example script: a <- data.frame(x1 = rnorm(100),

Hello dear R-help mailing list, My question is *not* about how factors are implemented in R (which is, if I understand correctly, that factors keeps numbers and assign levels to them). My question *is* about why so many functions that work on factors don't treat them as characters by default? Here are two simple examples: Example one turning the characters inside a factor into numeric: x

Hi! Yesterday I accidentally discovered this: > a <- LETTERS[1:5] > a [1] "A" "B" "C" "D" "E" > > a[1] <- factor(a[1]) > a [1] "1" "B" "C" "D" "E" BUT: > b <- factor(LETTERS[1:5]) > b [1] A B C D E Levels: A B C D E > b[1] <- factor(b[1]) > b [1] A B C D E

suppose I have two sets of vectors: x1,x2,...,xN and y1,y2,...,yN. I want N correlations: cor(x1,y1), cor(x2,y2), ..., cor(xN,yN). my sets of vectors are arranged as data frames x & y (vector=column): x <- data.frame(a=rnorm(10),b=rnorm(10),c=rnorm(10)) y <- data.frame(d=rnorm(10),e=rnorm(10),f=rnorm(10)) cor(x,y) returns a _matrix_ of all pairwise correlations: cor(x,y)

Hi all, I apologies in advance if I am missing something very simple here, but since I failed at resolving this myself, I'm sending this question to the list. I would appreciate any help in understanding how the rpart function is (exactly) computing the "improve" (which is given in fit$split), and how it differs when using the split='information' vs split='gini'

The problem: =========== Once a dendrogram has a branch with both a line type AND a color (which is a character color), the plot.dendrogram function will not plot and return an error. I say this is a bug because (I believe), we would like a dendrogram to be able to use character colors, while also allowing control over line types. This e-mail includes an example, and what I think a solution

Hello dear R help group, I would like to download the tRNA data on: http://gtrnadb.ucsc.edu/download.html And then import it into R. Can anyone direct me as to how to do so? Thanks, Tal ---------------------------------------------- My contact information: Tal Galili E-mail: Tal.Galili@gmail.com Phone number: 972-52-7275845 FaceBook: Tal Galili My Blogs: http://www.talgalili.com (Web and

At the end of a for loop its variables are still present: for (i in 1:10) { x <- vector(length=100000000) } ls() will print "i" and "x". this means that at the end of the for loop body I have to write rm(x) gc() is there a more elegant way to handle this? Thanks. -- Sam Steingold (http://sds.podval.org/) on Ubuntu 12.04 (precise) X 11.0.11103000

Hi, When qqnorm on a vector of length 10M+ I get a huge pdf file which cannot be loaded by acroread or evince. Any suggestions? (apart from sampling the data). Thanks. -- Sam Steingold (http://sds.podval.org/) on Ubuntu 11.10 (oneiric) X 11.0.11004000 http://mideasttruth.com http://honestreporting.com http://camera.org http://openvotingconsortium.org http://pmw.org.il

Hello all, I am trying to create a Clustergram in R. (More about it here: http://www.schonlau.net/clustergram.html) And to produce a picture similar to what is seen here: http://www.schonlau.net/images/clustergramexample.gif I was able (more or less) to write the R code for creating the image, but there is one thing I can't seem to figure out, that is the *changing*"smudge factor"

My question if in the Subject, but if to extend: I am specifically curious about WordPress blogs. But any solution will give me a lead. Thanks, Tal ---------------------------------------------- Contact me: Tal.Galili@gmail.com | 972-52-7275845 Read me: www.talgalili.com (Hebrew) | www.biostatistics.co.il (Hebrew) | www.r-statistics.com/ (English) [[alternative HTML version deleted]]

Suppose I have a vector of strings: c("A1B2","A3C4","B5","C6A7B8") [1] "A1B2" "A3C4" "B5" "C6A7B8" where each string is a sequence of <column><value> pairs (fixed width, in this example both value and name are 1 character, in reality the column name is 6 chars and value is 2 digits). I need to

Hello dear R-help group. I wish to plot a scatter plot using icons (or images) instead of points. Is it possible? and how so? Thanks, Tal ---------------------------------------------- My contact information: Tal Galili E-mail: Tal.Galili@gmail.com Phone number: 972-52-7275845 FaceBook: Tal Galili My Blogs: http://www.talgalili.com (Web and general, Hebrew) http://www.biostatistics.co.il

Dear Users, I have a variable in my dataset which is of type factor. But it actually contains numeric entries which like 5.735 4.759 ..... This is because the data was read from a CSV file into R and this variable contained other charaters which were not numeric. I have now dropped the records with the characters which are not numeric for this variable and want to change it to numeric srotage

I created a 2 D plan: > plot(range(-2.5,0.95),range(0.00,1.00),type="n",axes=TRUE) I made a projection of points with their coordonates (X,Y) in that plan > fullpoints=read.csv2("fullpoints.csv",h=T) > plot(fullpoints) The points are listed in that .csv file it is organized this way: 0,48875 0,142857143 0,409 0,142857143 0,45611 0,25 0,49833 0,222222222 0,61158

After reading more, I understand I didn't formulate my last question correctly, so please allow me to rephrase: What I am looking for is a way to save the R console session output. That is, a command that would combine the results of using: ?sink # And ?savehistory My motivation for this is that doing it will allow someone who is a blind user of R to be able to easily export his results to

Hi everybody, I would like to count how many times names in list L, nombreL, apear in list C, nombreC. Can I improve the next program? cuenta <- 0 topL <- length(nombreL) topC <- length(nombreC) for (i in 1:topL) { for (j in 1:topC) { k <- grep(noquote(nombreL[i]),nombreC[j])