[R] a loop to chang data matrix name

[Yu-Ling Wu]

Hi,

I have 50 data matrix x1 ~ x5. I want to write a loop
to check the number of 
rows for each data matrix. How to make the data matrix
name (numerical part)
increase by 1 each time it loops?

That is, 
loop1:  nrow(x1)
loop2: nrow(x2)
....
loop50: nrow(x50)

---------------------------------------------------------------
for (i in 1:50) {
   if nrow( xi ) > 20    <=== how to make this work?
      do someting ......
}
--------------------------------------------------------------

Thanks,
Yu-Ling Wu

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