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

Looking at the Daru::DataFrame source it looks like there are several methods for iterating through the frame by index, such as each_index.

There's also a method for reindexing: Daru::DataFrame#reindex which I believe could be used to replace the current index with a new index that you could build by sorting the old index with index.sort:

frame.reindex(frame.index.sort)

Disclaimer: I don't know what a dataframe is or what daru does or what the indexes look like.