require 'daru'
require 'awesome_print'

# In the code below we will create a DateTimeIndex starting from 2012-4-4 to 2012-4-19
# with a daily frequency. The 'D' supplied to the :freq argument specifies that frequency
# has to be daily. It can be any of the string offset alaises amongst those supported. See
# the section below for a complete overview of date offsets.

index = Daru::DateTimeIndex.date_range(:start => '2012-4-4', :end => '2012-4-19', :freq => 'D')

ap index.to_a
nil

# The following code will create a range between 2014-5-1 00:00:00 and 2014,5,2 00:00:00,
# with a difference of 6 hours between each date.

index = Daru::DateTimeIndex.date_range(:start => DateTime.new(2014,5,1), :end => DateTime.new(2014,5,2), :freq => '6H')
ap index.to_a; nil

offset = Daru::Offsets::Second.new(6)
index  = Daru::DateTimeIndex.date_range(:start => '2012-5-6', :end => '2012-5-6 20:00:00', :freq => offset)

index = Daru::DateTimeIndex.date_range(:start => '2012-5-2', :periods => 50, :freq => 'ME')

index.frequency

index = Daru::DateTimeIndex.new(
  [DateTime.new(2012,4,5), DateTime.new(2012,4,6), DateTime.new(2012,4,7), DateTime.new(2012,4,8)])

index = Daru::DateTimeIndex.new([
  DateTime.new(2012,4,5), DateTime.new(2012,4,6), DateTime.new(2012,4,7), DateTime.new(2012,4,8),
  DateTime.new(2012,4,9), DateTime.new(2012,4,10), DateTime.new(2012,4,11), DateTime.new(2012,4,12)
  ], freq: :infer)

index = Daru::DateTimeIndex.date_range(:start => '2012', :periods => 10, :freq => 'YEAR')

index.year

index.shift(Daru::Offsets::Hour.new(3))

index.shift(4) # Shift by 4 years

index.lag(Daru::DateOffset.new(days: 4))

index.lag(2)

index = Daru::DateTimeIndex.date_range(:start => '2012-3-4', :periods => 50000, :freq => 'H')
vector = Daru::Vector.new([1,2,3,4,5]*10000, index: index)
vector.head

vector['2012-4']

vector['2013']

vector['2013-2-4']

vector['2013-2-4 22']

vector[DateTime.new(2012,5,1)]

index = Daru::DateTimeIndex.date_range(:start => '2012-4-5', :periods => 50, :freq => 'D')
df = Daru::DataFrame.new({
  a: [1,2,3,4,5]*10,
  b: ['a','b','c','d','e']*10,
  c: ['foo', 'bar','baz','razz','jazz']*10
  }, index: index)

df.row['2012-5']