Insert column/row into DataFrame at specified location.

[kojix2]

Hello.
Daru::DataFrame doesn't seem to have insert function.

set_at or set_row_at will overwrite.
[]= add_vector does not specify the insertion location.

[Shekharrajak]

[]= add_vector does not specify the insertion location.

Can you please elaborate a bit this line?

[Shekharrajak]

This is good point.

we can add another column easily but then we have to order it. You can also do df[:player] = df.index but yeah we should have a method to insert a column in specific place. may be we can have #insert method having information about index of column, vector name and vector value.

[kojix2]

That's exactly what I wanted to say.

[Shekharrajak]

Thanks for letting us know this usecase.

[cyrillefr]

Hello @Shekharrajak , I would like to work on this one.

[Shekharrajak]

@cyrillefr , please go ahead. You can discuss your approach here once so that we can verify that you are going in right way then you can open a PR.

[cyrillefr]

Hello @Shekharrajak , sorry for the little delay.
My idea is : add some new data at the end, then reorder.
The method would look like this:
def insert_vector n, name, source
 vector = Daru::Vector.new(source, index: @index, name: @name)
 @data << vector
 @vectors = @vectors.add name
 ordr = @vectors.dup.to_a
 elmnt = ordr.pop
 ordr = ordr.insert n, elmnt
 self.order=ordr
end

[Shekharrajak]

Thanks @cyrillefr , please go ahead open a PR with few corner test cases. Love to see the changes in new release :)