将数据帧分割成固定尺寸的行 [英] Split Data Frame into Rows of Fixed Size

问题描述

我有一堆长度不等的数据帧，范围从大约15,000至50万。对于这些数据帧中的每一个，我想将它们分成更小的数据帧，每个数据帧都有300行，我将进行进一步的处理。我该怎么做？

这个（将R中的数据帧拆分为行数）提供部分答案，但不起作用，因为并不是所有的数据帧的长度都是300的倍数

如果可以提供plyr和非plyr解决方案，将非常感激。

谢谢

解决方案

我不明白为什么需要plyr解决方案。 split 工作得很好，甚至哈利自己也没有提出一个plyr / reshape2解决方案，当他看到以前的问题：

  split（dfrm，（0：nrow（dfrm）％/％300）＃modulo division 
  

会产生警告，但是由于您期待不均匀的分割结果，您应该忽略它。

I have a bunch of data frames with varying degrees of length, ranging from approx. 15,000 to 500,000. For each of these data frames, I would like to split them up into smaller data frames each with 300 rows which I would do further processing on. How can I do this?

This (Split up a dataframe in R by number of rows) provides a partial answer, but it doesn't work because not all my data frames have length that are multiples of 300.

Would greatly appreciate it if a plyr and non-plyr solution can both be provided.

Thank you!

解决方案

I don't understand why a plyr solution is needed. split works perfectly well and even hadley himself didn't suggest a plyr/reshape2 solution when he looked at the earlier question:

split(dfrm, (0:nrow(dfrm) %/% 300)  # modulo division

Does produce a warning but since you were expecting a non-evenly divisible result you should ignore it.

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