Splitting a large data frame into smaller segments

by 
 > str(split(df, (as.numeric(rownames(df))-1) %/% 200))
List of 6
 $ 0:'data.frame':  200 obs. of  3 variables:
  ..$ one  : num [1:200] -1.592 1.664 -1.231 0.269 0.912 ...
  ..$ two  : num [1:200] 0.639 -0.525 0.642 1.347 1.142 ...
  ..$ three: num [1:200] -0.45 -0.877 0.588 1.188 -1.977 ...
 $ 1:'data.frame':  200 obs. of  3 variables:
  ..$ one  : num [1:200] -0.0017 1.9534 0.0155 -0.7732 -1.1752 ...
  ..$ two  : num [1:200] -0.422 0.869 0.45 -0.111 0.073 ...
  ..$ three: num [1:200] -0.2809 1.31908 0.26695 0.00594 -0.25583 ...
 $ 2:'data.frame':  200 obs. of  3 variables:
  ..$ one  : num [1:200] -1.578 0.433 0.277 1.297 0.838 ...
  ..$ two  : num [1:200] 0.913 0.378 0.35 -0.241 0.783 ...
  ..$ three: num [1:200] -0.8402 -0.2708 -0.0124 -0.4537 0.4651 ...
 $ 3:'data.frame':  200 obs. of  3 variables:
  ..$ one  : num [1:200] 1.432 1.657 -0.72 -1.691 0.596 ...
  ..$ two  : num [1:200] 0.243 -0.159 -2.163 -1.183 0.632 ...
  ..$ three: num [1:200] 0.359 0.476 1.485 0.39 -1.412 ...
 $ 4:'data.frame':  200 obs. of  3 variables:
  ..$ one  : num [1:200] -1.43 -0.345 -1.206 -0.925 -0.551 ...
  ..$ two  : num [1:200] -1.343 1.322 0.208 0.444 -0.861 ...
  ..$ three: num [1:200] 0.00807 -0.20209 -0.56865 1.06983 -0.29673 ...
 $ 5:'data.frame':  123 obs. of  3 variables:
  ..$ one  : num [1:123] -1.269 1.555 -0.19 1.434 -0.889 ...
  ..$ two  : num [1:123] 0.558 0.0445 -0.0639 -1.934 -0.8152 ...
  ..$ three: num [1:123] -0.0821 0.6745 0.6095 1.387 -0.382 ...

If some code might have changed the rownames it would be safer to use:

 split(df, (seq(nrow(df))-1) %/% 200)

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