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require_relative '../../spec_helper'
describe "Complex.polar" do
it "returns a complex number in terms of radius and angle" do
Complex.polar(50, 60).should be_close(Complex(-47.6206490207578, -15.2405310551108), TOLERANCE)
Complex.polar(-10, -20).should be_close(Complex(-4.08082061813392, 9.12945250727628), TOLERANCE)
end
it "raises a TypeError when given non real arguments" do
->{ Complex.polar(nil) }.should raise_error(TypeError)
->{ Complex.polar(nil, nil) }.should raise_error(TypeError)
end
ruby_bug "#19004", ""..."3.2" do
it "computes the real values of the real & imaginary parts from the polar form" do
a = Complex.polar(1.0+0.0i, Math::PI/2+0.0i)
a.real.should be_close(0.0, TOLERANCE)
a.imag.should be_close(1.0, TOLERANCE)
a.real.real?.should be_true
a.imag.real?.should be_true
b = Complex.polar(1+0.0i)
b.real.should be_close(1.0, TOLERANCE)
b.imag.should be_close(0.0, TOLERANCE)
b.real.real?.should be_true
b.imag.real?.should be_true
end
end
end
describe "Complex#polar" do
it "returns the absolute value and the argument" do
a = Complex(3, 4)
a.polar.size.should == 2
a.polar.first.should == 5.0
a.polar.last.should be_close(0.927295218001612, TOLERANCE)
b = Complex(-3.5, 4.7)
b.polar.size.should == 2
b.polar.first.should be_close(5.86003412959345, TOLERANCE)
b.polar.last.should be_close(2.21088447955664, TOLERANCE)
end
end
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