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...= prctile(X,p) Description Y = prctile(X,p) calculates a value that is greater than p percent of the values in X. The values of p must lie in the interval [0 100]. For instance, if p = 50 then Y is the median of X Thanks!! -- -- -- Jose Luis Aznarte M. http://decsai.ugr.es/~jlaznarte Department of Computer Science and Artificial Intelligence Universidad de Granada Tel. +34 - 958 - 24 04 67 GRANADA (Spain) Fax: +34 - 958 - 24 00 79

...compute the column rank of a matrix? Is there not an R equivalent to Matlab's 'rank()'? I've been browsing for a time now and I can't find anything, so any help will be greatly appreciated. Best regards! -- -- Jose Luis Aznarte M. http://decsai.ugr.es/~jlaznarte Department of Computer Science and Artificial Intelligence Universidad de Granada Tel. +34 - 958 - 24 04 67 GRANADA (Spain) Fax: +34 - 958 - 24 00 79

...the expand.grid call at runtime, but I think that is not very elegant and, overall, I don't know how to do that. If combn() accepted repetitions, it'd be solved also. Any help will be greatly appreciated. Bests, -- -- Jose Luis Aznarte M. http://decsai.ugr.es/~jlaznarte Department of Computer Science and Artificial Intelligence Universidad de Granada Tel. +34 - 958 - 24 04 67 GRANADA (Spain) Fax: +34 - 958 - 24 00 79

...nly the first dimension of the vectors in A, i.e., not considering the case where there are ties amongst this first dimension. Does anyone have a clue about properly applying the lexicographical ordering? Thanks in advance! -- -- Jose Luis Aznarte M. http://decsai.ugr.es/~jlaznarte Department of Computer Science and Artificial Intelligence Universidad de Granada Tel. +34 - 958 - 24 04 67 GRANADA (Spain) Fax: +34 - 958 - 24 00 79

...or debug. 6.- Finish. Is this the proper (but quite awkward) way to proceed or there is an alternative to skip steps 2 to 4? I'm using emacs with ESS under linux. Thank you in advance for your time! Best regards, -- -- Jose Luis Aznarte M. http://decsai.ugr.es/~jlaznarte Department of Computer Science and Artificial Intelligence Universidad de Granada Tel. +34 - 958 - 24 04 67 GRANADA (Spain) Fax: +34 - 958 - 24 00 79

...is apart from the fact that I would like to use the Levenberg Marquardt algorithm which is not implemented in R (some discussion about this: http://tolstoy.newcastle.edu.au/R/help/00b/2492.html). Thank you! All the best, -- -- Jose Luis Aznarte M. http://decsai.ugr.es/~jlaznarte Department of Computer Science and Artificial Intelligence Universidad de Granada Tel. +34 - 958 - 24 04 67 GRANADA (Spain) Fax: +34 - 958 - 24 00 79

...| -------------------------- ------------ ------------- | | | | | ACF | | PACF | | | | | ------------ ------------- Does anyone know if that is possible at all? Cheers! -- -- -- Jose Luis Aznarte M. http://decsai.ugr.es/~jlaznarte Department of Computer Science and Artificial Intelligence Universidad de Granada Tel. +34 - 958 - 24 04 67 GRANADA (Spain) Fax: +34 - 958 - 24 00 79

...ns being the first three the result of A[,1] * B and the second three the result of A[,2] * B. What is the most efficient way to express that? I'm trying to use 'apply' with no success... Thanks for your help! -- -- Jose Luis Aznarte M. http://decsai.ugr.es/~jlaznarte Department of Computer Science and Artificial Intelligence Universidad de Granada Tel. +34 - 958 - 24 04 67 GRANADA (Spain) Fax: +34 - 958 - 24 00 79

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 to compute that gradient, it would be extremely convenient to be able to pass some parameters to the gradient function. I don't see how to do it given the fixed syntax

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 is as follows. I have a matrix Z with dimensions c(m, p). I have two vectors Gamma and Th with length p. What I want to do is, for j in 1:p, for each pair