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Hi ! I am trying to get at the covariance of the predictions of a linear model. Suppose the we have: > x<-runif(1000) > y<-2 + 25x*x +rnorm(1000) > lm1 <-lm(y~x, data = data.frame(y = y, x=x)) > x.pred <-runif(10) > y.hat <- predict(lm1, newdata = data.frame(x=x.pred)) I was wondering how to get an estimate of the covariance of y.hat which would be a 10 x 10 matrix telling be the uncertainty in each of the...

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...using the profiling feature of LLVM 3.1. Mostly, it works well, but seems to be wrong in a few cases. For example, I have found that the number of times a function executed is reported as less than the number of times that the basic block calling this function executed (the difference was about 25x!). I am copying out the exact functions below. The relevant parts are in bold font: *------------* *SOURCE : ------------* //accumulate error at a given edge sample point (round to nearest integral point) *inline void SampleEdgePoint(float xf, float yf, const FlexImage8u &EdgeMap, int &amp...

I wrote a function to calculate cosine distances between rows of a matrix. It uses two loops and is slow. Any suggestions to speed this up? Thanks in advance. theta.dist <- function(x){ res <- matrix(NA, nrow(x), nrow(x)) for (i in 1:nrow(x)){ for(j in 1:nrow(x)){ if (i > j) res[i, j] <- res[j, i] else { v1 <- x[i,] v2 <- x[j,]

I have moved the R-announce mailing list from the Majordomo software to a combination of procmail & mailman an hour or so ago. You find a link in the footer of this message giving an URL where you can modify your subscription, look at the archives (everything from the beginning in 1997) and more. CHANGE: Postings to R-announce are now moderated, ie. they have to be approved by a list

I have moved the R-announce mailing list from the Majordomo software to a combination of procmail & mailman an hour or so ago. You find a link in the footer of this message giving an URL where you can modify your subscription, look at the archives (everything from the beginning in 1997) and more. CHANGE: Postings to R-announce are now moderated, ie. they have to be approved by a list

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Hi All, I am trying to determine whether a mail server cluster based on Dovecot will be capable of supporting 500,000+ mailboxes with about 50,000 IMAP and 5000 active POP3 connections. I have looked at the Dovecot clustering suggestions here: http://blog.dovecot.org/2012/02/dovecot-clustering-with-dsync-based.html and some other Dovecot mailing list threads but I am not sure how many

A customer is looking to replace or augment their Sun Thumper with a ZFS appliance like 7320. However, the Thumper was used not only as a protocol storage server (home dirs, files, backups over NFS/CIFS/Rsync), but also as a general-purpose server with unpredictably-big-data programs running directly on it (such as corporate databases, Alfresco for intellectual document storage, etc.) in order to