[R] how to apply sample function to each row of a data frame?

[wangwallace]

this is a simple question, but I wasn't able to figure it out myself. 

here is the data frame:

M P Q
1 2 3
4 5 6
7 8 9

M, P, Q each represent a variable

I want to draw 2 random sample from each row separately to create a new data
frame. how can I do it?

thanks!!
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