R help - Mar 2012 - Testing for difference of distribution of two population(newbie)

Dear all,

I am novice in statistics.
I have two matrices (results from my experiments), each having ~400 point. I
want to test whether the points come from a same distribution or not.
Further, I have the results for each matrix (each experiment) in 4
replicates. What should I do?

# Repeats of experiments are in different columns
exp.1 = matrix (sample (1:20,1600, replace= TRUE), 400 ,4)
exp.2 = matrix (sample (1:20,1600, replace= TRUE), 400 ,4)


Thanks in advance

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