[R] How to select randomly from a matrix?

[WXE83]

Thanks, it works..

Regards,
Siti


Domenico Vistocco wrote:
> 
> WXE83 wrote:
>> Dear all,
>>
>> I got one problem here and hoping someone can help me on this. Say I have
>> a
>> 50 by 2 matrix and I don't know how to randomly select:
>>   
> data <- matrix(1:25, 50, 2)
>> 1. a pair of observations from the last 10th of the 50 observation from
>> the
>> matrix.
>>   
>  data[sample(41:50, 1, replace=FALSE),]
>> 2. how to select randomly an observation from the first 5 observations of
>> the second column in the matrix?
>>   
> data[sample(1:5, 1, replace=FALSE),2]
> 
> Ciao,
> domenico
>> Thanks....hope to hear from someone soon
>>
> 
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