Hi, Please see the email exchanges below. I am having trouble generating output that is large enough for our needs, specifically when using the GaussRF function. However, when I wrote Dr. Schlather (the author of the GaussRF function), he indicated that there is also a limit imposed by R itself. Is this something that we can overcome?
Thank you very much for any assistance you may provde. Regards, Jamesina ==============Original message text=============== From: Martin Schlather <[EMAIL PROTECTED]> Date: Mon, 21 May 2007 8:50:05 am CDT Subject: Re: GaussRF function Dear Jamesina, > x <- numeric( 200 / 0.025 * 1450 / 0.025) Error: cannot allocate vector of size 3625000 Kb So, the problem is at least also in R, and I guess that it is even deeper, namely that your system does not support 3GB for one pointer. (My own supports about 1.8 GB, but I never met your problem, since my needs have been more moderat (0.1 GB)). I suggest to write to the R-help mailing list, mentioning the above problem. If solved then I can check RandomFields . Cheers, Martin [EMAIL PROTECTED] wrote: > Dear Dr. Schlather, > > Thank you for your quick reply. Please find below the error: > >> library(RandomFields) >> library(MASS) >> >> x <- c(0, 200.0, 0.025) >> y <- c(0, 1450.0, 0.025) >> >> model <- "stable" >> scale <- 0.1 >> alpha <- 2 >> mean <- 0 >> variance <- 1.0 >> nugget <- 0 >> >> f <- GaussRF(x=x, y=y, model=model, grid=TRUE, gridtriple=TRUE, > + param=c(mean, variance, nugget, scale,alpha)) > Error: cannot allocate vector of size 3625515 Kb > In addition: Warning messages: > 1: Reached total allocation of 2560Mb: see help(memory.size) > 2: Reached total allocation of 2560Mb: see help(memory.size) > > Regards, > Jamesina > > > > ==============Original message text=============== > On Mon, 21 May 2007 1:03:10 am CDT Martin Schlather wrote: > > > Dear Jamesina, > > would you send me the error message > and where it appears? > > Cheers, > Martin > > > [EMAIL PROTECTED] wrote: >> Dear Dr. Schlather, >> >> I am a recent Ph.D. graduate at Northwestern University in Evanston, IL >> working for a >> research project with the GaussRF function in the R program. I saw that you >> are the >> author of the GaussRF documentation, and am hoping you may be able to be of > assistance >> for one question. >> >> We are trying to create an output "f" that is 8000 x 58000 numbers (an ~ 8GB >> output > file). >> However, it appears that we are limited by either the R program or the >> GaussRF function > to >> only a matrix creating a 3 GB output. Do you know if there is a way for us >> to overcome >> this? >> >> Below is the brief code I am using in case it would be of help. >> Thank you in advance for any assistance you may provide. >> >> Best regards, >> Jamesina >> >> >> >> library(RandomFields) >> library(MASS) >> >> x <- c(0, 200.0, 0.025) >> y <- c(0, 1450.0, 0.025) >> >> model <- "stable" >> scale <- 0.1 >> alpha <- 2 >> >> mean <- 0 >> variance <- 1.0 >> nugget <- 0 >> >> >> f <- GaussRF(x=x, y=y, model=model, grid=TRUE, gridtriple=TRUE, >> param=c(mean, variance, nugget, scale,alpha)) >> >> write.matrix(f,file='C:\\Documents and Settings\\Jamesina\\My Documents\ >> \gauss_8000x58000cells.dat') >> >> >> >> ................................. >> Jamesina J. Simpson, Ph.D. >> Dept. of Electrical Engineering and Computer Science >> Assistant Master of Shepard Residential College >> Northwestern University >> 2145 Sheridan Road, EECS Dept. >> Evanston, IL 60208 >> 847-332-4750 >> >> > > -- Prof. Dr. Martin Schlather Institut für Mathematische Stochastik & Zentrum für Statistik Georg-August-Universität Göttingen Maschmühlenweg 8-10 D -- 37073 Göttingen email: [EMAIL PROTECTED] http://www.stochastik.math.uni-goettingen.de/research/index.phpphone: +49 (0)551 39 13 509 fax : +49 (0)551 39 13 505 ===========End of original message text=========== ................................. Jamesina J. Simpson Ph.D. candidate, Dept. of Electrical Engineering and Computer Science Assistant Master of Shepard Residential College Northwestern University 2145 Sheridan Road, EECS Dept. Evanston, IL 60208 847-332-4750
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