R help - May 2008 - (no subject)

Hi everyone, 

Is there any function to standardize a matrix. For sure it must, but i can't
find it. For standardize, i just mean, to make the mean as zero and standard
deviation as one.It is also call z-score.
Thanks in advance



_________________________________________________________________
MSN Video. 

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Hi Paticia,

Perhaps ?scale is what you are looking for:

X=matrix(1:9,ncol=3)
[,1] [,2] [,3]
[1,]    1    4    7
[2,]    2    5    8
[3,]    3    6    9

scale(X)
[,1] [,2] [,3]
[1,]   -1   -1   -1
[2,]    0    0    0
[3,]    1    1    1
attr(,"scaled:center")
[1] 2 5 8
attr(,"scaled:scale")
[1] 1 1 1


HTH,

Jorge


On Thu, May 8, 2008 at 6:48 AM, patricia garcía gonzález <
kurtney_84@hotmail.com> wrote:
>
> Hi everyone,
>
> Is there any function to standardize a matrix. For sure it must, but i
> can't find it. For standardize, i just mean, to make the mean as zero
and
> standard deviation as one.It is also call z-score.
> Thanks in advance
>
>
>
> _________________________________________________________________
> MSN Video.
>
>        [[alternative HTML version deleted]]
>
> ______________________________________________
> R-help@r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
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>
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