search for: ramasamy

...quot;formu" not found I think this has something to do with formula and environments but I do not know enough to solve it myself. I searched the archive without much help (perhaps I was using the wrong keywords). Any help would be very much appreciated. Thank you. Regards, -- Adaikalavan Ramasamy ramasamy at cancer.org.uk Centre for Statistics in Medicine http://www.ihs.ox.ac.uk/csm/ Wolfson College Annexe Tel : 01865 284 408 Linton Road, Oxford OX2 6UD Fax : 01865 284 424

...te(x, expression(Delta), "values")) plot(1:10, main=paste(x, eval(expression(Delta)), "values")) plot(1:10, main=paste(x, expression(Delta, "values" ))) plot(1:10, main=paste(x, expression(paste(Delta, "values" )))) Many thanks. Regards, -- Adaikalavan Ramasamy ramasamy at cancer.org.uk Centre for Statistics in Medicine http://www.ihs.ox.ac.uk/csm/ Cancer Research UK Tel : 01865 226 677 Old Road Campus, Headington, Oxford Fax : 01865 226 962

...TRUE TRUE TRUE TRUE TRUE TRUE > plot( 1:10 ) Bus Error and R terminates to the shell prompt. I have searched the archives with no success. Can anyone kindly help me fix the problem or at least show me how to get more information about the error. Thank you. -- Adaikalavan Ramasamy ramasamy at cancer.org.uk Medical Statistician Centre for Statistics in Medicine http://www.ihs.ox.ac.uk/csm/ Medical Statistics Group Tel : 01865 226 677 Cancer Research UK Fax : 01865 226 962

...n1-1)*v1 + (n2-1)*v2 )/(n1 + n2 - 2) denom2 <- sp * sqrt( 1/n1 + 1/n2 ) num / denom2 # gives 0.5913777 I tested this using R-1.9.1 (21/06/2004) on Redhat Fedora Core 2 and Windows 2000 Professional with the same results. Any suggestions would be kindly appreciated. Regards, -- Adaikalavan Ramasamy ramasamy@cancer.org.uk Centre for Statistics in Medicine http://www.ihs.ox.ac.uk/csm/ Cancer Research UK Tel : 01865 226 677 Old Road Campus, Headington, Oxford Fax : 01865 226 962

Hello guys, I am wondering the default way of transferring arguments in R. Is it by value or by ref in default case, or could that be changed explicitly? Cheers, Xiaofan --- Xiaofan Li Department of Applied Mathematics and Theoretical Physics University of Cambridge

Hello, I am trying to use self created functions in other scripts than the one where they are stored. For the moment I am using the following structure of commands to do that: 1. Load the text file with the functions in the current script: x=parse("path") 2. transform the tex in a function: f1=eval(x[1]), f2=eval(x[2]) if more than one function is stored in the text file 3. use the

Hi all, If the question below as been answered before I apologize for the posting. I would like to get the frequencies of occurrence of all values in a given variable in a multivariate dataset. In short for each variable (or field) a summary of values contained with in a value:frequency pair, there can be many such pairs for a given variable. I would like to do the same for several such variables.

Just out of curiosity, what is the difference between the terms for package and library ? Why are we loading a package with the library() command ? If this is a case of RTFM, I would be happy to do so if pointed in the right direction. I have searched the FAQ and mail archives and only came up with http://tolstoy.newcastle.edu.au/R/help/05/02/12162.html but this still does not explain what is

Hi there, Suppose mu is constant, and error is normally distributed with mean 0 and fixed variance s. I need to find a statistics that: Y_i = mu + beta1* I1_i beta2*I2_i + beta3*I1_i*I2_i + +error, where I_i is 1 Y_i is from group A, and 0 if Y_i is from group B. It is large when beta1=beta2=0 It is small when beta1 and/or beta2 is not equal to 0 How can I find it by R? Thank you very much

...t) A.vs.B A.vs.C A.vs.D B.vs.C B.vs.D C.vs.D g1 -6 7 -5 13 1 -12 g2 13 6 -1 -7 -14 -7 g3 3 -1 -6 -4 -9 -5 g4 12 8 3 -4 -9 -5 g5 16 -3 8 -19 -8 11 Regards, -- Adaikalavan Ramasamy ramasamy at cancer.org.uk Centre for Statistics in Medicine http://www.ihs.ox.ac.uk/csm/ Cancer Research UK Tel : 01865 226 677 Old Road Campus, Headington, Oxford Fax : 01865 226 962

Hi, I have a matrix with column names starting with a character in [0-9]. After some matrix operations (e.g. copy to another matrix), R seems to add a character 'X' in front of the column name. Is this a normal default behaviour of R? Why has it got this behaviour? Can it be changed? What would be the side effect? Thank you. Regards, Gilbert [[alternative HTML version deleted]]

.... Even then you still have 80 variances to estimate. Besides, I don't think lda() does that. If you really have to discrinimate 40 data points with 80 variables, use methods that do not rely on the estimation of covariance matrix. Andy > -----Original Message----- > From: Adaikalavan Ramasamy [mailto:ramasamy at stats.ox.ac.uk] > Sent: Friday, July 12, 2002 4:08 PM > To: r-help at r-project.org; allstat at jiscmail.ac.uk > Subject: [R] meaning of error message about collinearity > > > Just a quick question. I am trying to fit an LDA model with a > restricted >...

...39;re happy to know the solution, thanks should go to the person concerned. I thank all the three people named below. (1) my solution after reading the R-FAQ 7.21 as Uwe Ligges pointed out > for ( i in 1:10 ) { + assign(paste("my.file.", i, sep=""), NULL) + } > (2) Adai Ramasamy's solution > for(obj in paste("my.ftn", 1:10, sep="")) assign(obj, NULL) > ### or > > for(i in 1:10) assign(paste("my.ftn", i, sep=""), NULL) > (3) James Holtman's solution # For example, if you want to generate 10 groups # of 5...

Dear all, I am trying to create a web interface using Perl-CGI to call R plots and to display them. The following codes works perfectly fine when I copy and paste into the console directly or if I save it into script.file and then R --no-save < script.file producing the graphs. jpeg("graph.jpeg", width=400, height=400) plot(rnorm(100)) dev.off() Now, I put the line system("R

Hi all! I 'm beginner and i develop a bio-application with VB and i need some statistic functions! could i calculate StdError, CoeffOfVariance, SumSquared with R langage? if yes, what are functions to use? I need also to use ANOVA and t-test... Thanks for your help! Laurent Houdusse Analyste Programmeur

Forgive me for I do not fully comprehend the idea of classes and methods but I was wondering if someone could help explain why the function args () behaves the way it does. Why does args(cut) show the simplified version instead of the more complete one as in help("cut"). This is true for few other functions (e.g. plot, rep). > args(cut) function (x, ...) Sometime I can get

Dear all, I have a matrix X with 47 lines and say 500 columns - values are in {0,1}. I'd like to compare lines. For that, I first did: for (i in 1:(dim(X)[1]-1)) for (j in (i+1):dim(X)[1]) { Y <- X[i,]+Y[j,] etc. but, since it takes a long time, I would prefer avoding loops; for that, my first idea was to add this matrix: X1=X[,rep(1:46,46:1)] to this one: res=NULL for (i in

Hi all, My data genes [,1] [,2] [,3] [,4] [1,] 25 72 23 55 [2,] 34 53 41 33 [3,] 26 43 26 44 [4,] 36 64 64 22 [5,] 47 72 67 34 stu<-t.test(genes[,1:2],genes[,3:4]) > stu$p.value [1] 0.4198002 i get 1 pvalue for the entire col1:col2 Vs col3:col4. I am trying to get 5 p values for the 5 rows i have. I am trying to avoid a for loop coz my

Hi all, for example: > X<- rnorm(1000) > X0 <- 0.899 I want to draw a density distribution plot with a arrow pointer indicating the position of X0, meanwhile, giving out the p-value. any functions? Thanks very much.

...ple does pretty much what you're asking about (with a scatterplot and histograms, but the idea should be the same). Hope this helps, Matthew Wiener Applied Computer Science & Mathematics Dept. Merck Research Labs Rahway, NJ 07090 732-594-5303 -----Original Message----- From: Adaikalavan Ramasamy [mailto:ramasamy at stats.ox.ac.uk] Sent: Monday, August 12, 2002 5:27 AM To: r-help at stat.math.ethz.ch Subject: [R] Attaching marginal summary plots to the main matrix plot Dear helplist, I am trying to visualise a datamatrix together with its marginal densities. Suppose dat <- matrix( rnor...