search for: jlaznarte

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2007 Apr 06
4
Computing the rank of a matrix.
...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
2008 Sep 30
1
ordering problem
...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
2007 Sep 11
5
Percentiles in R
...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
2008 Aug 28
3
Plots spanning columns
...---------- ------------- | | | | | 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
2008 Aug 15
2
Combination with repetition
...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
2007 Mar 26
5
Developer work cycle
...his 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
2007 Sep 27
1
A matrix multiplication
...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
2007 Sep 07
2
Matlab's lsqnonlin
...ke 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
2008 Jan 04
1
Multi-dimensional function.
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