ruby - How can I sort by index in Daru?

Question

In Daru, I know that by Daru::DataFrame#sort we can sort dataframe by its column, but I noticed method does not work if we want to sort dataframe by its index.

Question

• I believe Daru::DataFrame#sort is for sorting by column. How can I sort a dataframe by index?

Answer 1

查看Daru::DataFrame 源，看起来有几种方法可以按索引遍历帧，例如each_index.

还有一种重新索引的方法：Daru::DataFrame#reindex我相信它可以用来用新索引替换当前索引，您可以通过对旧索引进行排序来构建新索引index.sort：

frame.reindex(frame.index.sort)

免责声明：我不知道数据框是什么，或者 daru 做什么，或者索引是什么样的。