How to reverse rows of Daru::DataFrame?

Question

Given a Daru::DataFrame object, how do I reverse the order of rows?

For example...

> Daru::DataFrame.new([{a: 2, b: 2}, {a: 1, b: 3}, {a: 3, b:1}])
=> #<Daru::DataFrame(3x2)>
       a   b
   0   2   2
   1   1   3
   2   3   1

When I have data frame like above, how can I just reverse the order of rows, to obtain the DataFrame of

score 0 · Answer 1 · edited Apr 26 '19 at 06:43

0

Try this

df.sort [:a], ascending: false

edited Apr 26 '19 at 06:43

Mate Mrše

answered Apr 26 '19 at 06:12

kojix2

1

This command will sort the rows by column `:a`'s value, not reversing the given rows... – Yuki Inoue May 02 '19 at 08:16
1

`df.reindex Daru::Index.new([0,1,2].reverse)` – kojix2 May 02 '19 at 10:31
Thanks, the answer given in above comment solved the problem. Can you include the code in comment to the answer so that I can accept it as an answer? – Yuki Inoue May 04 '19 at 07:29

1 Answers1