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Hi! I want to plot three graphs (residuals, ACF and PACF of a model). Ideally I would use a c(2,2) disposition where the residuals plot would start at position 1,1 and span to position 1,2. Then...

Dear all, I'm having trouble using the 'apply' function to multiply some arrays. Let A be a 500x2 array and B a 500x3 array. I need a vector C which has 6 columns being the first three the result...

Hi! Maybe this is a silly question, but I need the column rank (http://en.wikipedia.org/wiki/Rank_matrix) of a matrix and R function 'rank()' only gives me the ordering of the elements of my matrix. How can...

Hi there! Still struggling to translate Matlab code into R's tsDyn package. Here is my question: Is there in R an equivalent function to Matlab's prctile()? To the moment I thought it was quantile(), but I just realized...

Hi again! I'm using the 'optim' method to fix the parameters of a model. I have written the function to be minimised and another function which returns the gradient of the error. Now my problem is that, in order...

Hi! I'm translating some code from Matlab to R and I found a problem. I need to translate Matlab's function 'lsqnonlin' (http://www-ccs.ucsd.edu/matlab/toolbox/optim/lsqnonlin.html) into R, and at the beginning I...

Hi there! I need some assistance here with vector orderings. I have a set of q vectors of length p, grouped by rows in a matrix A, q?p, that I need to order lexicographically (http://en.wikipedia.org/wiki...

Hi there! I can't find any information about creating combinations with repetitions in R. The function combn() does create combinations, but _without_ repetitions. Here is what I need to do: svIter <- 1000 xx <- matrix(rnorm(m*n), c(m...

Ok, of course you were right. As Stefan pointed out, it was a problem of the type of the vector: it was a factor and hence the quantile was not what expected. Thank you all!! Jose Luis Aznarte M. escribi...

Hi! I've been browsing through the last months' archive and I can't find an answer to my question, so here it is (let's hope it's not too obvious): I'm working on extensions of an R...

Hi there! Happy new year to everyone! There's a piece of code that I must write that's driving me crazy. Maybe any of you has previous experiences in something similar. Any help will be greatly appreciated! The problem...

Thank you all! But the problem is that quantile() returns "how many data" are greater than p percent, and not a value in the domain of the vector under scrutiny. For example, I have a vector > x [1] "-0,39559...