Dear all, I am trying to speed up some code and I would like to check fast that it works by comparing two different matrices. What is the fastest way to do that in R? Best Regards Alex
fast way to compare two matrices
4 messages · Alaios, PIKAL Petr, Peter Dalgaard
Hi x <- matrix(rnorm(1e6), 1000,1000) y <- matrix(rnorm(1e6), 1000,1000) identical(x,y) [1] FALSE The response is almost instant. In case you are not satisfied with the unspecific answer be more specific with your question. Regards Petr r-help-bounces at r-project.org napsal dne 27.04.2011 13:04:37:
Dear all, I am trying to speed up some code and I would like to check fast that it
works
by comparing two different matrices. What is the fastest way to do that in R? Best Regards Alex
______________________________________________ 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.
That was great :) REgards
--- On Wed, 4/27/11, Petr PIKAL <petr.pikal at precheza.cz> wrote:
From: Petr PIKAL <petr.pikal at precheza.cz> Subject: Odp: [R] fast way to compare two matrices To: "Alaios" <alaios at yahoo.com> Cc: R-help at r-project.org, r-help-bounces at r-project.org Date: Wednesday, April 27, 2011, 12:18 PM Hi x <- matrix(rnorm(1e6), 1000,1000) y <- matrix(rnorm(1e6), 1000,1000) identical(x,y) [1] FALSE The response is almost instant. In case you are not satisfied with the unspecific answer be more specific with your question. Regards Petr r-help-bounces at r-project.org napsal dne 27.04.2011 13:04:37:
Dear all, I am trying to speed up some code and I would like to
check fast that it works
by comparing two different matrices. What is the fastest way to do that in R? Best Regards Alex
______________________________________________ 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.
On Apr 27, 2011, at 13:29 , Alaios wrote:
That was great :) REgards
You may need to turn your sarcasm detector back on. Beware:
x <- matrix(rnorm(1e6), 1000,1000) y <- solve(solve(x)) identical(x,y)
[1] FALSE
all.equal(x,y)
[1] TRUE
summary(c(x-y))
Min. 1st Qu. Median Mean 3rd Qu. Max. -6.442e-11 -6.204e-12 7.550e-15 2.670e-15 6.212e-12 6.722e-11
--- On Wed, 4/27/11, Petr PIKAL <petr.pikal at precheza.cz> wrote:
From: Petr PIKAL <petr.pikal at precheza.cz> Subject: Odp: [R] fast way to compare two matrices To: "Alaios" <alaios at yahoo.com> Cc: R-help at r-project.org, r-help-bounces at r-project.org Date: Wednesday, April 27, 2011, 12:18 PM Hi x <- matrix(rnorm(1e6), 1000,1000) y <- matrix(rnorm(1e6), 1000,1000) identical(x,y) [1] FALSE The response is almost instant. In case you are not satisfied with the unspecific answer be more specific with your question. Regards Petr r-help-bounces at r-project.org napsal dne 27.04.2011 13:04:37:
Dear all, I am trying to speed up some code and I would like to
check fast that it works
by comparing two different matrices. What is the fastest way to do that in R? Best Regards Alex
______________________________________________ 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.
______________________________________________ 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.
Peter Dalgaard Center for Statistics, Copenhagen Business School Solbjerg Plads 3, 2000 Frederiksberg, Denmark Phone: (+45)38153501 Email: pd.mes at cbs.dk Priv: PDalgd at gmail.com