require File.expand_path('../../../../spec_helper', __FILE__)
require 'matrix'

ruby_version_is "1.9.3" do
  describe "Vector#inner_product" do
    it "returns the inner product of a vector" do
      Vector[1, 2, 3].inner_product(Vector[0, -4, 5]).should == 7
    end

    it "returns 0 for empty vectors" do
      Vector[].inner_product(Vector[]).should == 0
    end

    it "raises an error for mismatched vectors" do
      lambda {
        Vector[1, 2, 3].inner_product(Vector[0, -4])
      }.should raise_error(Vector::ErrDimensionMismatch)
    end

    ruby_bug "Bug #6967", "1.9.3" do
      it "uses the conjugate of its argument" do
        Vector[Complex(1,2)].inner_product(Vector[Complex(3,4)]).should == Complex(11, 2)
      end
    end
  end
end
