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require_relative '../../spec_helper'
require_relative 'fixtures/classes'
require 'matrix'
describe "Matrix#real?" do
it "returns true for matrices with all real entries" do
Matrix[ [1, 2], [3, 4] ].real?.should be_true
Matrix[ [1.9, 2], [3, 4] ].real?.should be_true
end
it "returns true for empty matrices" do
Matrix.empty.real?.should be_true
end
it "returns false if one element is a Complex" do
Matrix[ [Complex(1,1), 2], [3, 4] ].real?.should be_false
end
# Guard against the Mathn library
guard -> { !defined?(Math.rsqrt) } do
it "returns false if one element is a Complex whose imaginary part is 0" do
Matrix[ [Complex(1,0), 2], [3, 4] ].real?.should be_false
end
end
end
describe "Matrix#real" do
it "returns a matrix with the real part of the elements of the receiver" do
Matrix[ [1, 2], [3, 4] ].real.should == Matrix[ [1, 2], [3, 4] ]
Matrix[ [1.9, Complex(1,1)], [Complex(-0.42, 0), 4] ].real.should == Matrix[ [1.9, 1], [-0.42, 4] ]
end
it "returns empty matrices on the same size if empty" do
Matrix.empty(0, 3).real.should == Matrix.empty(0, 3)
Matrix.empty(3, 0).real.should == Matrix.empty(3, 0)
end
describe "for a subclass of Matrix" do
it "returns an instance of that subclass" do
MatrixSub.ins.real.should be_an_instance_of(MatrixSub)
end
end
end
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