stat stat wrote:

>   I want to see at which row minimum value of the second column occures.
>    
>   Therefore I made the following loop:

[snip while-loop]

> 
>   Is there any more effective way to do that in terms of time consumption?

I don't know about timing, but I understand that loops are somewhat 
slow. Assuming that x is the first column and y is the second column:

        D <- data.frame( x = 1:10, y = rnorm(10) )
        D$x[ which.min(D$y) ]

See the help of which.min for more info.

-Jarimatti

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