Odp: fast way to compare two matrices
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
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