similar to: Finding coordinates for maximum of a function

Dear all, I have two coordinates vectors, say X and Y of length n. I want to generate for each couple of coordinates X1,Y1 X2,Y2 X3,Y3....Xn,Yn a random coordinate which is located in a square define as X +/- dx and Y +/- dy. I saw the runif function which can generate for just one value at a time what I want : runif(1, X - dx, X + dx) for X and runif(1, Y - dy, Y + dy) for Y. I would like

Hi. Maybe this is a stupid question. If so, I apologize, but here goes. Suppose I have a function f1(x,...) that calls a function f2(y1,y2,...,yn) in the following way: if x satisfies a certain condition, then I want to call f2(x,y2,...,yn); otherwise I want to use the default value of y1, if there is one. I could do something like the following: v <- ifelse ( is.null(x), f2( , y2,...,

Hi to all, how could I to rotate automatically a data sheet which was imported by read.xls? x1 x2 x3 .... xn y1 1 4 7 ... xn/y1 y2 2 5 8 .... xn/y2 y3 3 6 9 ....xn/y2 yn ... ... ... Xn/Yn to y1 y2 y3 .... yn x1 1 2 3 ..... Yn/x1 x2 4 5 6 .... Yn/x2 x3 7 8 9 .... Yn/x2 xn ... ... ... ..... Yn/xn Kind regards Knut

I have a set of data in the form x1, y1, z1 x1, y2, z2 ... x1, yN, zN x2, y1, z(N+1) x2, y2, z(N+2) ... x2, yN, z(2N) ...and so on... xM, yN, val(M*N) I have been trying to figure out how to get R to use this data in a persp plot. So far the only thing that I can figure out to do is to break the data file into three different files. The first file contains the x-coordinate data: x1 x2

Hello First, thanks for the help for an earlier question about error handling! I have problem filtering a dataset. I'm trying to filter the data in the y columns based on the values in the x column, e.g.: x y1 y2 yn 1.0 1 NA 3 2.0 1 NA 11 2.0 2 NA NA 3.0

Dear all, I wonder if there are some function or package in R which can do the iterative proportional fitting. In the exponential model f(y1,...yn)=exp(a'yi+b'(yi*yj)+.....+c'(y1*...*yn)+constance), instead of the canonical parameters, I use maginal probability instead of a and log odds ratio instead of b. and for the order higher than 3, I use the canonical way or even assume

Hi, I have multiple responses y1, y2, .., yn, and would like to do linear regression for each of them with x1, x2, ..., xm. Instead of doing regression n times, it it possible to do it all at once? I tried lm(y1+y2 ~ x1 + x2 + x3) and lm added y1 y2 and then did the regression. thanks Jeff

Dear all, I wonder which R algorithm could perform a search of local maxima in an spatial grid, in other words, having the coordinates of a map (x,y,z... up to 6 coordinates) and then the altitude/height at each point (h) (in total 7 numerical variables) I would like to localise the peaks (local maxima) of that topological surface. Which R algorithm can perform this? Thanks a lot, Josep Maria,

Hola. Como hago para calcular la "Maxima Verosimilitud" de unos datos con distribucion uniforme? saludos. -- Leo [[alternative HTML version deleted]]

Hi folks, I''m having trouble getting gems to install rails. It just keeps asking me which version of thin I want to install. Until I choose skip or cancel, in which case I''m told that something has gone wrong. Any advice? Thanks kindly, Tommy PS: Gems is 0.94. --------------------------------------------------------------------- tommy@tommy-laptop:~/www/blog$ sudo gem

Hello I''m trying to use rubyonrails, but had some troubles: First, there was an issue with gems (it did not finished the installation): # gem install rails Config file /root/.gemrc does not exist Attempting local installation of ''rails'' Local gem file not found: rails*.gem Attempting remote installation of ''rails'' Updating Gem source index for:

Hello, I have a dataset with 4 variables, each consisting of a vector, all with the same length. I start by interpolating the first three variables using the function "interp", and plot the interpolation successfully using "filled.contour". I then interpolate the first two variables and a fourth using "interp" again, but when I try to overlay the contour lines

Hi all, Is there a simple function already implemented for getting the ISO weeks of a Date object? I couldn't find one, and so wrote my own function to do it, but would appreciate a pointer to the "default" way. If a function is not yet implemented, could the code below be of interest to submit to CRAN? Best Regards, Gustaf --------------------

suppose I have two sets of vectors: x1,x2,...,xN and y1,y2,...,yN. I want N correlations: cor(x1,y1), cor(x2,y2), ..., cor(xN,yN). my sets of vectors are arranged as data frames x & y (vector=column): x <- data.frame(a=rnorm(10),b=rnorm(10),c=rnorm(10)) y <- data.frame(d=rnorm(10),e=rnorm(10),f=rnorm(10)) cor(x,y) returns a _matrix_ of all pairwise correlations: cor(x,y)

Hi, This might seem like a simple question but at the moment I am stuck for ideas. The columns of my matrix in which some data is stored are of this form: X1 Y1 X2 Y2 X3 Y3 ... Xn Yn with n~100. I would like to look at just the X values (i.e. odd column numbers). Is there an easy way to loop round extracting only these columns? Any help would be appreciated.

Hi Colin, I think fcgi is only required for testing. I do without it and directly open the output files in my browser. Maybe try saying no to ramaze or whatever depends on fcgi? On Mon, Jun 1, 2009 at 18:02, Colin MacNaughton <colin.macnaughton at gmail.com> wrote: > I''m trying to install the latest webgen on Windows XP but am met with: > > [C:/Programs] gem install webgen

(clean install) >gem install rails Attempting local installation of ''rails'' Local gem file not found: rails*.gem Attempting remote installation of ''rails'' Install required dependency activesupport? [Yn] y Install required dependency activerecord? [Yn] y Install required dependency actionpack? [Yn] y Install required dependency actionmailer? [Yn] y

Dear All, I try to invoke a second program (called "gencont") within a R script. However this second program needs some time to finish. After finishing the output should be read into R and used for further calculation. Under windows, it perfectly works: result<-shell("gencont < yn.txt",intern=TRUE,wait=TRUE) # R waits untill the program finishes (apporx 3 min) and

From: xxgreat@hotmail.com To: r-help-bounces@r-project.org Subject: compare a vector and a row of a matrix Date: Sun, 26 Sep 2010 23:23:52 +0800 Hi Everyone: I am trying to compare a vector and rows of a matrix for example > xn <- c(1,2,4,4,5,5,5,6) >yn <- c(1,2,5,7,1,2,3,1) >mtrx <- cbind(xn, yn) when I tried, say, > c (1,4), the result was TRUE, TRUE.

Hello, I am new to Rails and the Linux world coming from 12 years of advanced VB programming. I am writing to try and clear up some confusion on my part about installing Mongrel. Please don''t take this as a rant, I do appreciate the effort that y''all put into the community, but as a newbie, I was, and still am confused. I want to learn about Mongrel, so it found