[R] (no subject)

[ruipbarradas at sapo.pt]

Hello,

Please respond to the list, not just to me.
If you just want the first vector ofm the matrices, try the following.

fun <- function(..., n, replace = FALSE){
    m <- do.call(rbind, list(...))
    idx <- sample(nrow(m), n, replace = replace)
    m[idx, 1]
}

n <- 3 * nrow(Young.list1) * 0.25
fun(Young.list1, Young.list2, Young.list3, n = n, replace = FALSE)

Hope this helps,

Rui Barradas
Citando MARYAM <firoozi_maryam6858 at yahoo.com>:

> Hello, I want to select randomly to three matrix with fixed  
> number.for example i want to select 25% from three matrix  
> randomly(select first column of each matrix). On Dey 30, 1394 AP, at  
> 0:05, ruipbarradas at sapo.pt wrote:
>  
>>  

Hello,

What do you want to sample? Rows? With or without replacement? You  
need to give us more information on what you want.

Start by seeing the help page for ?sample

Hope this helps,

Rui Barradas
 

Citando MARYAM <firoozi_maryam6858 at yahoo.com>:

> Dear mr/madam
> I have 3 matrix with 20 rows and 3 columns like this: I want to  
> sample randomly from three matrix and put it in a vector.How can i  
> do that?
>
> Young.list1<- matrix(NA,nrow= 20,ncol=3)
> Young.list1[,1]<- 1:20
> Young.list1[,2]<- 0.6
> Young.list1[,3]<- 500
> colnames(Young.list1)<- c("ID","r","EBV")
> ###########################################
> Young.list2<- matrix(NA,nrow= 20,ncol=3)
> Young.list2[,1]<- 21:40
> Young.list2[,2]<- 0.7
> Young.list2[,3]<- 600
> colnames(Young.list2)<- c("ID","r","EBV")
> ###########################################
> Young.list3<- matrix(NA,nrow= 20,ncol=3)
> Young.list3[,1]<- 41:60
> Young.list3[,2]<- 0.8
> Young.list3[,3]<- 700
> colnames(Young.list3)<- c("ID","r","EBV")
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>
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Ligações:
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[1] http://www.r-project.org/posting-guide.htmland

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