require 'daru'

def sample_df idx
  Daru::DataFrame.new({
    a: 1..5,
    b: 'a'..'e',
    c: 11..15
  }, index: idx)
end

idx = Daru::CategoricalIndex.new [:a, :b, :a, :b, :c]

df = sample_df idx

df.row[:a, :c]

df.row[0, 1]

df[:a, :b]

df.row.at 0, 1, 2

df.at 0, 1

df.row[:a] = ['x', 'y', 'z']
df

df[:a] = [1]*5
df

#reset dataframe
df = sample_df idx


df.row.set_at [0, 4], ['x', 'y', 'z']
df

df.set_at [0, 1], [nil]*5
df