Hello,
My R knowledge could not take me any further, so this request !
I have a matrix of dimensions (1185 X 1185). I want to calculate standard
deviation of entire matrix.
sd function of {stats} calculates standard deviation for each row/column,
giving 1 X 1185 matrix as result. I would like to have 1 X 1 matrix as
result.
Any ideas, how to do this ?
TIA
Chakri
--
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Hi! The sample below should give you what you want: M = matrix(runif(100), 10, 10) sd(as.numeric(M)) So the as.numeric command is the key. It transforms the matrix to a 1D vector. Or alternatively without using as.numeric: M = matrix(runif(100), 10, 10) M dim(M) = 100 M sd(M) Here I use the dim command to set the dimensions to a vector of 100 long. cheers, Paul On 08/02/2011 11:07 AM, chakri wrote:> Hello, > > My R knowledge could not take me any further, so this request ! > > I have a matrix of dimensions (1185 X 1185). I want to calculate standard > deviation of entire matrix. > sd function of {stats} calculates standard deviation for each row/column, > giving 1 X 1185 matrix as result. I would like to have 1 X 1 matrix as > result. > > Any ideas, how to do this ? > > TIA > Chakri > > -- > View this message in context: http://r.789695.n4.nabble.com/Standard-Deviation-of-a-matrix-tp3711991p3711991.html > Sent from the R help mailing list archive at Nabble.com. > > ______________________________________________ > 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.-- Paul Hiemstra, Ph.D. Global Climate Division Royal Netherlands Meteorological Institute (KNMI) Wilhelminalaan 10 | 3732 GK | De Bilt | Kamer B 3.39 P.O. Box 201 | 3730 AE | De Bilt tel: +31 30 2206 494 http://intamap.geo.uu.nl/~paul http://nl.linkedin.com/pub/paul-hiemstra/20/30b/770
Hi> Hi! > > The sample below should give you what you want: > > M = matrix(runif(100), 10, 10) > sd(as.numeric(M)) > > So the as.numeric command is the key. It transforms the matrix to a 1D > vector. Or alternatively without using as.numeric: > > M = matrix(runif(100), 10, 10) > M > dim(M) = 100or dim(M)<-NULL> M > sd(M) > > Here I use the dim command to set the dimensions to a vector of 100long.> > cheers, > Paul > > On 08/02/2011 11:07 AM, chakri wrote: > > Hello, > > > > My R knowledge could not take me any further, so this request ! > > > > I have a matrix of dimensions (1185 X 1185). I want to calculatestandard> > deviation of entire matrix. > > sd function of {stats} calculates standard deviation for eachrow/column,> > giving 1 X 1185 matrix as result. I would like to have 1 X 1 matrix as > > result. > > > > Any ideas, how to do this ? > > > > TIA > > Chakri > > > > -- > > View this message in context: http://r.789695.n4.nabble.com/Standard- > Deviation-of-a-matrix-tp3711991p3711991.html > > Sent from the R help mailing list archive at Nabble.com. > > > > ______________________________________________ > > R-help at r-project.org mailing list > > https://stat.ethz.ch/mailman/listinfo/r-help > > PLEASE do read the posting guidehttp://www.R-project.org/posting-guide.html> > and provide commented, minimal, self-contained, reproducible code. > > > -- > Paul Hiemstra, Ph.D. > Global Climate Division > Royal Netherlands Meteorological Institute (KNMI) > Wilhelminalaan 10 | 3732 GK | De Bilt | Kamer B 3.39 > P.O. Box 201 | 3730 AE | De Bilt > tel: +31 30 2206 494 > > http://intamap.geo.uu.nl/~paul > http://nl.linkedin.com/pub/paul-hiemstra/20/30b/770 > > ______________________________________________ > R-help at r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guidehttp://www.R-project.org/posting-guide.html> and provide commented, minimal, self-contained, reproducible code.
On Aug 2, 2011, at 8:48 AM, Petr PIKAL wrote:> Hi > >> Hi! >> >> The sample below should give you what you want: >> >> M = matrix(runif(100), 10, 10) >> sd(as.numeric(M)) >> >> So the as.numeric command is the key. It transforms the matrix to a >> 1D >> vector. Or alternatively without using as.numeric: >> >> M = matrix(runif(100), 10, 10) >> M >> dim(M) = 100 > > or dim(M)<-NULLshortest would surely be: sd( c(M) ) -- David.> >> M >> sd(M) >> >> Here I use the dim command to set the dimensions to a vector of 100 > long. >> >> cheers, >> Paul >> >> On 08/02/2011 11:07 AM, chakri wrote: >>> Hello, >>> >>> My R knowledge could not take me any further, so this request ! >>> >>> I have a matrix of dimensions (1185 X 1185). I want to calculate > standard >>> deviation of entire matrix. >>> sd function of {stats} calculates standard deviation for each > row/column, >>> giving 1 X 1185 matrix as result. I would like to have 1 X 1 >>> matrix as >>> result. >>> >>> Any ideas, how to do this ? >>> >>> TIA >>> Chakri >>> >>> -- >>> View this message in context: http://r.789695.n4.nabble.com/ >>> Standard- >> Deviation-of-a-matrix-tp3711991p3711991.html >>> Sent from the R help mailing list archive at Nabble.com. >>> >>> ______________________________________________ >>> 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. >> >> >> -- >> Paul Hiemstra, Ph.D. >> Global Climate Division >> Royal Netherlands Meteorological Institute (KNMI) >> Wilhelminalaan 10 | 3732 GK | De Bilt | Kamer B 3.39 >> P.O. Box 201 | 3730 AE | De Bilt >> tel: +31 30 2206 494 >> >> http://intamap.geo.uu.nl/~paul >> http://nl.linkedin.com/pub/paul-hiemstra/20/30b/770 >> >> ______________________________________________ >> 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.David Winsemius, MD West Hartford, CT