[R] Quantile question

[Joshua Wiley]

Hi,

This should do it, for details, see ?apply

a <- matrix(rnorm(10000),100,100)
t(apply(a, 1, quantile, probs = c(.3, .5)))

Basically you apply() the quantile function to each row (the 1, 2
would indicate columns) in the object 'a'.

HTH,

Josh

On Wed, Oct 6, 2010 at 10:20 PM, Takos <zyoungs at gmail.com> wrote:
>
> Simple Question
>
> I have 100x100 matrix and I want to calculte each row's 30,50% quantile
>
> ex)
>
> a=matrix(rnorm(10000),100,100)
> quantile(a[1,],c(0.3,0.5))
> quantile(a[2,],c(0.3,0.5))
> .
> .
> .
> .
>
>
> I want get results at once.
>
> so I try quantile(a[1:100,],c(0.3,0.5)) but I can get what I exactly want.
>
> How can I calculte that?
>
>
>
>
>
> --
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>
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-- 
Joshua Wiley
Ph.D. Student, Health Psychology
University of California, Los Angeles
http://www.joshuawiley.com/