search for: twopass

...> package with these dimensional summary statistics, using C code. (And I > pointed him to the `two-pass' algorithm for variance.) Here are the functions that didn't make it into R's base package, which should be very similar to the S-Plus functions of the same names. The "twopass" argument determines whether Andy's two-pass algorithm (Chan Golub & LeVegue) is used (it's slower but more accurate). In real life I set the "twopass" default to FALSE, because in finance noise is always bigger than signal. I am cc'ing to R-help, as this is really...

I need to calculate a large number of t statistics, and would like to do so via matrix operations. So far I have figured out a way to calculate the mean of each row of the matrix: d <- matrix(runif(100000,1,10), 1000, 10) # some test data s <- rep(1,ncol(d)) # a sum vector to use for matrix multiplication means <- (d%*%s)/ncol(d) This is at least 1 order of magnitude faster than

Hi people, If there is a fn "colMeans" why isn't there a "colSDs" etc Thanks, Phil. -- Philip Rhoades Pricom Pty Limited (ACN 003 252 275) GPO Box 3411 Sydney NSW 2001 Australia Mobile: +61:0411-185-652 Fax: +61:2:8923-5363 E-mail: pri at chu.com.au -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-help mailing list -- Read

Is it possible to compute the variance of every column in a matrix without a loop? -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe" (in the "body", not the subject !) To: r-help-request at stat.math.ethz.ch

I am using the R 2.2.1 in a Windows XP environment. I have a dataframe with 12 columns and 1,000 rows. (Some of the rows have 1 or fewer values.) I am trying to use rowVars to calculate the variance of each row. I am getting the following message: ?Error in na.remove.default(x) : length of 'dimnames' [1] not equal to array extent? Is there a good work-around?

...ooks, or were they "optimized" in any way 2.2 Is it possible, that some codebooks are stored in the header, but are never used (even in long (>3min) files)? 4 Are there any docs about the psychoacoustic model? 5 Does it compress using two passes (whole file)? 5.1 Is it necessary to use twopass to do "real" VBR (1. pass: estimate BR; 2.pass: compress)? (ups, this is a general question about VBR) 5.2 Same applies to windowsizes: It has to check the file before choosing optimal windowsizes Another question that has nothing to do with oggenc: Are there any compliance test Ogg Vor...

...ttp://v2v.cc/~j/ffmpeg2theora Some changes that went into this release: * Use Skeleton 4.0 by default (including index), can be disabled with --skeleton-3 or --no-skeleton * update to FFmpeg 0.6 branch * use ogv/oga/ogx depending on input if no output name is specified * aspect ratio fix in twopass mode * update documentation Source: http://v2v.cc/~j/ffmpeg2theora/downloads/ffmpeg2theora-0.27.tar.bz2 svn co https://svn.xiph.org/tags/ffmpeg2theora/ffmpeg2theora-0.27 ? Binaries: Linux 32bit http://v2v.cc/~j/ffmpeg2theora/ffmpeg2theora-0.27.linux32.bin Linux 64bit http://v2v.cc/~...