search for: centred

Dear R users I have the matrix of the centres of some clusters, e.g. 20 clusters each with 100 dimentions, so this matrix contains 20 rows * 100 columns numeric values. I have collected new data (each with 100 numeric values) and would like to keep the above 20 centres fixed/'unmoved' whilst just see how my new data fit in this grouping system, e.g. if the data is close to cluster 1

Dear All, I am trying to convert to POSIXct after pasting a date and a time in character format with strptime. It is probably obvious but I don't understand why I get an error message after bsamp$spltime<-strptime(test,format="%d-%B-%y %H:%M") whereas I can get what I want if I do it in 2 steps and rbinding ? Thanks and best regards, Jean-Louis This is the R console output

Hi, I would like to draw 10 uniformly distributed sample points from a circle with redius one and centered at (0,0). Is there any R function to do that?   Thanks, [[alternative HTML version deleted]]

...n I use the function to scale and centre the levels of the fixed effects (e.g., X and Y; both have two levels) and write them to new columns: ex: dat$cX<-scale(as.numeric(dat$X),center = TRUE, scale = FALSE) dat$cY<-scale(as.numeric(dat$Y),center = TRUE, scale = FALSE) and compare the lme of centred model ran on cX and cY with the non-centred model run on X and Y: centred.model <- lmer(quest.ACC~1+cX*cY+(1|Subject)+(1|SetNo),data=dat.Transfer,family='binomial') non.centred.model<- lmer(quest.ACC~1+X*Y+(1|Subject)+(1|SetNo),data=dat.Transfer,family='binomial') I find tha...

...omputer practical sessions related to the development and validation of clinical prediction models. These are currently written for Stata and I am in the process of writing them for use in R too (as I far prefer R to Stata!) I notice that predictions made from a Cox model in Stata are based on un-centred variables, while they are based on centred variables in R. I am aware that variable centring is the preferred approach to ensure sensible predictions from models and thus usually I am pleased that variable centring is automatically applied within coxph in R. However, for the sake of producing ide...

...ight=3.0) pie(pcts, clockwise=TRUE, labels=rep(NA,10), radius=1.0) dev.off() With pie(pcts, clockwise=TRUE, labels=rep(NA,10), radius=1.0) lines(c(-1,1,1,-1,-1),c(-1,-1,1,1,-1)) I can see that the chart exactly fits inside a box with side 2 and centre (0,0). So far so good. But this box is not centred in the X-window device (somewhat up, and somewhat to the right, from centre). The result from the above postscript() command is a file with %%DocumentMedia: special 216 216 0 () () %%BoundingBox: 0 0 216 216 (where of course "216" means 3*72 points = 3 inches), and when this is display...

Dear all, I am using "coxme" function in Kinship library to fit random treatment effect nested within centre. I got 3 treatments (0,1,2) and 3 centres. I used following commands, but got an error. > ugroup=paste(rep(1:3,each=3),rep(0:2,3),sep='/') > mat1=bdsmatrix(rep(c(1,1,1,1,1,1,1,1,1),3),blocksize=rep(3,3),dimnames=list(ugroup,ugroup)) >

Hi, All Forgive me if this is a stupid newbie question. I'm having no luck googling an answer to this, probably because I don't know the right R terminology to frame my question. I want to know how to run an R function on each combination of the values of 2 or more variables. In SAS-speak this is multiple "BY variables" or "CLASS variables". In R I've figured

Hello, I have used the functions agnes and cutree to cluster my data (4977 objects x 22 variables) into 8 clusters. I would like to refine the solution using a k-means or similar algorithm, setting the initial cluster centres as the group means from agnes. However my data matrix has NA's in it and the function kmeans does not appear to accept this? > dim(centres) [1] 8 22 > dim(data)

Hi there. We're going to develop a call centre app for internal use in our office. The call centre is probably going to be a java-based client installed on a windows machine that our secretary can use. Features should be a way to see incoming calls, answer them, and then transfer the calls to our different users/groups/divisions. If it also could be possible to have a way to see if the user

Hi there, I tried to add a few circles on an existing figure using the following codes grid.circle(x=0.5, y=0.5, r=0.1, draw=TRUE, gp=gpar(col=5)) grid.circle(x=0.5, y=0.5, r=0.3, draw=TRUE, gp=gpar(col=5)) grid.circle(x=0.5, y=0.5, r=0.5, draw=TRUE, gp=gpar(col=5)) points(0.5, 0.5, col = 5) # centre of the circle , but all circles moved away from the centre. Could we do any

Dear all, I am trying to find the solution for the optimization problem focused on the finding minimum cost. I used the solution proposed by excel solver, but there is a restriction in the number of variables. My data consists of 300 rows represent cities and 6 columns represent the centres. It constitutes a cost matrix, where the cost are distances between each city and each of six centres. ..+

OS Solaris 5.9 (9) Generic_122300-13 (clean build) nscd daemon has been disabled and is not running No NIS or NISPLUS Samba Version 3.0.26a Complied using the following options --with-acl-support -with-winbind -with-pam smbd, nmbd & winbind daemons are all started [global] workgroup = MTCB2 security = domain log level = 3 log file =

Dear all, I'm working with satellite images in R and plotting them via the code below. I was wondering whether coordinates (spatial["x"], spatial["y"]) are used as centre coordinates of the pixels in the GRID? In this script; spatial["x"] & spatial["y"] are the centre coordinates of the satellite image pixels. I'm asking this because some

I would like to centre titles for pairs of plots in a 3-x-2 array. Each row of the array corresponds to a calendar year and I would like to have the year value centred between the two plots in the row, and just above their upper edges. I have attached an example in "demo.pdf" showing roughly what I want. I managed to produce the example using mtext(outer=TRUE,side=3,line=<whatever>,text=YR,font=2) I got the appropriate (negative) values for &q...

Hi Folks I have had a look through the Features list, and I see that the system does support an auto attendant, however is it possible to have say 5 telephone numbers that a person would dial and have 5 different messages I.e Dial 555-1121 and you get a message for companyA call centre Dial 555-1131 and you get a message for companyB call centre Dial 555-1141 and you get a message for companyC

[Cc-ing xapian-discuss as other people may be able to help] On Sat, Feb 19, 2011 at 11:45:20PM +0000, francis wrote: > I installed xapian1.2.4 on Lucid; libxapian1.2.4 seems to be > incompatible with synaptic quick search - typing two or more chars > produces a segmentation fault. The synaptic search(find) button works > ok. Software Centre search is also broken. I guess you're

Hi, I am trying to put together a biplot using symbols and different colours instead of text as points. Someone has previously suggested using this code: PC <- prcomp (iris[,1:4]) lambda <- PC$sdev * sqrt(nrow(PC$x)) plot (t(t(PC$x)/lambda),pch=16,col=as.numeric(iris[,5])) par (new=T) Rot <- t(t(PC$rotation)*lambda) XLIM <- c(-max(abs(Rot[,1])),max(abs(Rot[,1]))) XLIM <-

In the following code the arrow symbols do not rotate with the text on the Mac OS window, however the do rotate on X11 port on Mac OS. (R version 1.71) x <- c(0,10.) y <- c(0,10.) offset <- 3 centre <- 5 plot(x,y, xlim=range(x), ylim=range(y),type="n", xlab="",ylab="", main="",xaxt="n",yaxt="n") for (i in (seq(0, 340,

Dear List members, I am trying to produce some trellis graphics and to save them in a postscript file but I only get blank files. R behaviour is certainly strange because I use a loop to generate the graphics (see code below). When I change the loop variable myself the postscript graphics are OK. I am using R 1.9.1 (2004-06-21) on Debian GNU/Linux which I try to keep updated on a daily basis. I