search for: kxk

I want to use read.table to input many files, each for a different year. I would like to use the macro variable 't' to refer to the exact file that I would like to input the data using read.table. How could I do this? Thank you! for (t in 1970:2005) { edge <- read.table(file="edge_t.csv", header=T, sep=",") ## I will have many rows of code following the

Hi Folks, Given k RVs with MVN distribution N(mu,S) (S a kxk covariance matrix), let (w.l.o.g.) X1 denote the first r of them, and X2 the last (k-r). Likewise, let mu1 and mu2 denote their respective expectations. Then, of course, the expectation of X2 given X1=x1 is mu2 + S21*inv(S22)*(x1 - mu1) and the covariance matrix of X2 given X1=x2 is S22 - S...

Hi, I would like to generate below triangular matrix for some a. 0 0 0 0 0 0 1 0 0 0 0 0 a 1 0 0 0 0 a^2 a 1 0 0 0 a^3 a^2 a 1 0 0 a^4 a^3 a^2 a 1 0 What's an efficient way to do this? (this matrix being KxK, K very large) Thanks Zava -------------------------------------------------------- This is not an offer (or solicitation of an offer) to buy/se...{{dropped}}

HI, there, I have a data set with special structure. It is in n*(5*p): n is the number of observations or data points 5*p is the matrix for each data point I'd like to conduct discriminant analysis to this data set. How could I do? And where could I find related references to solve this problem? Thanks a lot! Jieping Zhao PhD student in Bioinformatics, NCSU Lab

I have two variables in a data frame, I want to generate two additional variables. For every observations (i.e. every row), I want the first new variable 'min' to carry the minimum of the two existing variables, and I want the second new variable 'max' to carry the maximum of the two existing variables. I then want to sort the data frame by min and max, and delete duplicated rows

I want to delete a row from a data frame XYZ where A == "TRUE". Let's assume there are five variables in this data frame XYZ. My deletion is based on the TRUE vs. FALSE value under variable A. How do I do this? Thanks! My current code: for (i in 1:length(XYZ$A)) if (XYZ$A == "FALSE") XYZ<-XYZ else XYZ<- XYZ[-i,] Error message is: Error in if (XYZ$A ==

Hello list. I'm trying to rebuild the 2.6.9.67.0.20.EL kernel, but it fails even without modifications. How did I try it? Created a (non-root) build environment (not a mock ) Installed the kernel.scr.rpm and did a rpmbuild -ba --target=`uname -m` kernel-2.6.spec 2> prep-err.log | tee prep-out.log The build failed at the end: Processing files: kernel-xenU-devel-2.6.9-67.0.20.EL Checking

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