CODEWITHSUNDEEP
arraysruby
Rilcon42
Rilcon42

Reputation: 9763

Extracting values from array of arrays

I am trying to extract the three values in each sub array, but it doesnt seem to work. Is there something unusual about the object that is returned, or is my array extraction code incorrect?

#https://github.com/Nedomas/indicators
require 'active_support'
require 'active_support/core_ext'
require 'indicators'

my_data = Indicators::Data.new([1,2,3,4,3,2,4,6,1,2])
temp=my_data.calc(:type => :bb, :params => 2)
puts temp.inspect
temp.output.each do |x| puts "#{x[0]},#{x[1]},#{x[2]}" end

output

king@death-star ~/Desktop/_REPOS/misc/stock_analysis/forex/oanda/ruby $ ruby temp.rb 
#<Indicators::Main:0x00000002c1f9b0 @abbr="BB", @params=[2, 2], @output=[nil, [1.5, 2.914213562373095, 0.08578643762690485], [2.5, 3.914213562373095, 1.0857864376269049], [3.5, 4.914213562373095, 2.085786437626905], [3.5, 4.914213562373095, 2.085786437626905], [2.5, 3.914213562373095, 1.0857864376269049], [3.0, 5.82842712474619, 0.1715728752538097], [5.0, 7.82842712474619, 2.1715728752538097], [3.5, 10.571067811865476, -3.5710678118654755], [1.5, 2.914213562373095, 0.08578643762690485]]>
temp.rb:9:in `block in <main>': undefined method `[]' for nil:NilClass (NoMethodError)
    from temp.rb:9:in `each'
    from temp.rb:9:in `<main>'

Upvotes: 0

Views: 113

Answers (2)

Roman Kiselenko
Roman Kiselenko

Reputation: 44360

According to your output the first value of output variable is nil, you can use compact:

Returns a copy of self with all nil elements removed.

temp.output.compact.each do |x| 
   puts "#{x[0]},#{x[1]},#{x[2]}"
end

Upvotes: 1

Ursus
Ursus

Reputation: 30056

First element of your array of array is nil and nil has no method []. You can use compact method to remove nil elements.

http://docs.ruby-lang.org/en/2.0.0/Array.html#method-i-compact

Upvotes: 1

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