[R] New Sampling question

[wangwallace]

Hi, Mike,

thank you very much!!:)

the following two functions are really helpful, which I didn't even know.
Actually, I searched the forum for something like this, but failed. Now I am
still trying to make up my own functions. :)

sample(a[,2],2) #randomly draw two numbers from a column

sample(a[2,],2) #randomly draw two numbers from a row 
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