search for: dens2

...rary(mvtnorm) c<-data.frame(rnorm(1000,5,sd=1),rnorm(1000,6,sd=1)) c2<-data.frame(rnorm(1000,10,sd=2),rnorm(1000,7,sd=1)) xx=seq(0,20,0.1) yy=seq(0,20,0.1) xmult=cbind(rep(yy,201),rep(xx,each=201)) dens=dmvnorm(xmult,mean(c),cov(c)) dmat=matrix(dens,ncol=length(yy),nrow=length(xx),byrow=F) dens2=dmvnorm(xmult,mean(c2),cov(c2)) dmat2=matrix(dens2,ncol=length(yy),nrow=length(xx),byrow=F) contour(xx,yy,dmat,lwd=2) contour(xx,yy,dmat2,lwd=2,add=T) ############################################## Is their an easy way to do this (maybe with dmvnorm()?) and could I interpret the intersect ("s...

Hi all. I would like to highlight overlapping regions of two densities and I could not find a way to do it. Here is the sample code: myd <- c(2,4,5, 4,3,2,2,3,3,3,2,3,3,4,2,4,3,3,3,2,2.5, 2, 3,3, 2.3, 3, 3, 2, 3) myd1 <- myd-2 plot(range(density(myd)$x, density(myd1)$x), range(density(myd)$y, density(myd1)$y), type = "n") lines(density(myd), col=1, lwd=4)

Dear friends, Do you know how to calculate the CONCAVE hull of a set of points (2- dimensional or n-dimensional)? is that possible in R? (With a "smoothing" parameter of course). Best, -- Corrado Topi Global Climate Change & Biodiversity Indicators Area 18,Department of Biology University of York, York, YO10 5YW, UK Phone: + 44 (0) 1904 328645, E-mail: ct529 at york.ac.uk

Hi all, this is OT, but maybe someone can give me a clue. I've got data from eye tracker experiments (750 data points). These figures show how the data lock like |** * ***** |*** ****** | ** **** | * * | | * * | | * |-------------- |--------------- Y axes display velocity, x axes display time, * are the data points.

Are there any functions in R for fitting distributions? In particular, I would like to fit the weibull and extreme-value distributions when: i) the data are given and the maximum likelihood estimates are required; ii) the sample moments are available but the complete data record is not (so moment estimates are required). Any suggestions will be gratefully received.

An object of class `density' has `x' and `y' components, which are what you need to do the plot. Just bind them into a matrix and use write() to write to a file. HTH, Andy -----Original Message----- From: Hinnerk Boriss [mailto:boriss at izbi.uni-leipzig.de] Sent: Thursday, November 14, 2002 7:12 AM To: R-help at stat.math.ethz.ch Subject: [R] evaluating density objects Hi! Is