mirror of
https://github.com/ruby/ruby.git
synced 2022-11-09 12:17:21 -05:00
e87fb88be8
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@64831 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
43 lines
1.3 KiB
Ruby
43 lines
1.3 KiB
Ruby
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
|