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limits
9 messages · Hassan Mohamed, r at quantide.com, Jorge Ivan Velez +4 more
Dear R User I am using JGR on a Linux Ubuntu Computer with 2 Cpus When Opening JGR, one Cpu goes up to 100% even if no calculation is yet started Did any of you already noticed this strange behaviour? Thanks for your help Andrea
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Hassan Mohamed wrote:
Hey, what is the R function for the mathematical limit ? e.g. to calculate and return the amount that the expression X^2 +X +2 approach as X approach 2 (X-> 2)
So you want some software that can do symbolic calculations? In that case use other software. R is designed for numerical analyses. Uwe Ligges
thanks
hassan
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r at quantide.com wrote:
Dear R User I am using JGR on a Linux Ubuntu Computer with 2 Cpus When Opening JGR, one Cpu goes up to 100% even if no calculation is yet started Did any of you already noticed this strange behaviour?
Does it take very long? On the first start it builds some databases and that takes some time if you have installed many packages. Uwe Ligges
Thanks for your help Andrea
______________________________________________ R-help at r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
The point is that one Cpu stays at 100% for all time JGR is up. Any ideas? Andrea
Uwe Ligges wrote:
r at quantide.com wrote:
Dear R User I am using JGR on a Linux Ubuntu Computer with 2 Cpus When Opening JGR, one Cpu goes up to 100% even if no calculation is yet started Did any of you already noticed this strange behaviour?
Does it take very long? On the first start it builds some databases and that takes some time if you have installed many packages. Uwe Ligges
Thanks for your help Andrea
______________________________________________ R-help at r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
1 day later
On Tue, 05 May 2009 15:12:00 +0200 "r at quantide.com" <r at quantide.com> wrote: RC> The point is that one Cpu stays at 100% for all time JGR is up. RC> Any ideas? RC> Andrea I believe it is a bug with JGR. Unfortunately it is existing for quite some time now. (I am using Fedora Linux since years and try it from time to time.) Just try another gui like emacs with ess or rkward. hth Stefan
6 days later
Uwe Ligges <ligges at statistik.tu-dortmund.de> wrote:
So you want some software that can do symbolic calculations? In that case use other software. R is designed for numerical analyses.
In particular, if you are looking for good free software, you might try Maxima.
Mike Prager, NOAA, Beaufort, NC * Opinions expressed are personal and not represented otherwise. * Any use of tradenames does not constitute a NOAA endorsement.
Try the rSymPy or Ryacas packages. In the rSymPy code below the var command defines x as symbolic to sympy and then we perform the computation:
library(rSymPy)
Loading required package: rJava
sympy("var('x')")
[1] "x"
sympy("limit(x*x + x + 2, x, 2)")
[1] "8" Or using devel version define x as symbolic first to sympy and then to R:
library(rSymPy)
source("http://rsympy.googlecode.com/svn/trunk/R/Sym.R")
sympy("var('x')")
[1] "x"
x <- Sym("x")
limit(x*x + x + 2, x, 2)
[1] "8" or using Ryacas:
library(Ryacas)
Loading required package: XML
x <- Sym("x")
Limit(x^2+x+2, x, 2)
[1] "Starting Yacas!" expression(8) More info is available here which you should read before using these packages: http://rsympy.googlecode.com http://ryacas.googlecode.com On Tue, May 5, 2009 at 5:39 AM, Hassan Mohamed
<hassan_hany_fahmy at yahoo.com> wrote:
Hey, what is the R function for the mathematical limit ? e.g. to calculate ?and return the amount that the expression X^2 +X +2 approach as X approach 2 (X-> 2) thanks hassan ? ? ? ?[[alternative HTML version deleted]]
______________________________________________ R-help at r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.