daru

https://github.com/sciruby/daru

Ruby

Data Analysis in RUby

Daru::DataFrame#rolling_fillna!

Rolling fillna
replace all Float::NAN and NIL values with the preceeding or following value

df = Daru::DataFrame.new({
 a: [1,    2,          3,   nil,        Float::NAN, nil, 1,   7],
 b: [:a,  :b,          nil, Float::NAN, nil,        3,   5,   nil],
 c: ['a',  Float::NAN, 3,   4,          3,          5,   nil, 7]
})

=> #<Daru::DataFrame(8x3)>
     a   b   c
 0   1   a   a
 1   2   b NaN
 2   3 nil   3
 3 nil NaN   4
 4 NaN nil   3
 5 nil   3   5
 6   1   5 nil
 7   7 nil   7

2.3.3 :068 > df.rolling_fillna(:forward)
=> #<Daru::DataFrame(8x3)>
     a   b   c
 0   1   a   a
 1   2   b   a
 2   3   b   3
 3   3   b   4
 4   3   b   3
 5   3   3   5
 6   1   5   5
 7   7   5   7

Source | Google | Stack overflow

Edit

git clone [email protected]:sciruby/daru.git
cd daru
open lib/daru/dataframe.rb

Contribute

# Make a new branch
git checkout -b -your-name--update-docs-Daru--DataFrame-rolling_fillna--for-pr

# Commit to git
git add lib/daru/dataframe.rbgit commit -m "better docs for Daru::DataFrame#rolling_fillna!"

# Open pull request
gem install hub # on a mac you can `brew install hub`
hub fork
git push <your name> -your-name--update-docs-Daru--DataFrame-rolling_fillna--for-pr
hub pull-request

# Celebrate!