[R] Standard Deviation of a matrix

[David Winsemius]

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)<-NULL

shortest 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.
>>>
>>> ______________________________________________
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>>
>>
>> -- 
>> 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