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...plot the bidimensional Autocovariance Function. the input matrix is a matrix that describe a spatial location over a 2-D space and I want to use it in the same way I can use a time serie in the 1-D acf. Thanks, Nicola. ================================================================= Dr. Nicola Marchetti Phone: +39 0532 291331 Chemistry Department Fax: +39 0532 240709 University of Ferrara Luigi Borsari, 46 I-44100 Ferrara ITALY -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-announce mailing list -- Read http://www.ci.tuwie...

...plot the bidimensional Autocovariance Function. the input matrix is a matrix that describe a spatial location over a 2-D space and I want to use it in the same way I can use a time serie in the 1-D acf. Thanks, Nicola. ================================================================= Dr. Nicola Marchetti Phone: +39 0532 291331 Chemistry Department Fax: +39 0532 240709 University of Ferrara Luigi Borsari, 46 I-44100 Ferrara ITALY -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-announce mailing list -- Read http://www.ci.tuwie...

...mes so slow that I'm forced to kill the process. This usually does not happen at the beginning of the session. The problem seems to arise when the system opens the dialog window to choose the directory and file name. (R version 2.6.1 under Windows XP) Thank you all Giovanni -- Giovanni M. Marchetti Dipartimento di Statistica, "G. Parenti", University of Florence viale Morgagni, 59 Phone: +39 055 4237 261 I 50134 Firenze, Italy Fax: +39 055 4223 560 [[alternative HTML version deleted]]

...ck" "other" "white" Thus, here the reference level is "black" and this is a bit strange as the first row of the table is "white". This little "infelicity" is in fact caused by expand.grid. Thanks again -- Giovanni -- < Giovanni M. Marchetti > Dipartimento di Statistica, Univ. di Firenze Phone: +39 055 4237 204 viale Morgagni, 59 Fax: +39 055 4223 560 I 50134 Firenze, Italy email: gmm at ds.unifi.it

Dear R-users, I found a strange problem working with products of two matrices, say: a <- A[i, ] ; crossprod(a) where i is a set of integers selecting rows. When i is empty the result is in a sense random. After some trials the right answer (a matrix of zeros) appears. --------------- Illustration -------------------- R : Copyright 2003, The R Development Core Team Version 1.8.0

Hi All, I have the following adjacency matrix for a directed graph: [,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [1,] 0 0 0 0 0 0 0 0 [2,] 0 0 0 0 0 0 0 0 [3,] 1 0 0 0 0 0 0 0 [4,] 0 0 1 0 0 0 0 0 [5,] 0 0 1 0 0 0 0 0 [6,] 1 1 0 0 0 0 0 0 [7,] 0 0

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Hi, I'm seeing a problem with 4.7 where, very rarely, the system seems to "lockup". No panic is given. I was able to track it down to all processors were halted (in the idle loop) since machdep.cpu_idle_hlt=1. The system is a 2 physical XEON procs with hyperthreading enabled. The system was behaving as though the 8254 system clock was not going off. The only thing I can think of is