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require_relative '../../spec_helper'
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require_relative 'fixtures/classes'
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2017-05-07 08:04:49 -04:00
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require 'matrix'
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describe "Matrix.diagonal" do
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before :each do
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@m = Matrix.diagonal(10, 11, 12, 13, 14)
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end
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it "returns an object of type Matrix" do
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@m.should be_kind_of(Matrix)
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end
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it "returns a square Matrix of the right size" do
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@m.column_size.should == 5
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@m.row_size.should == 5
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end
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it "sets the diagonal to the arguments" do
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(0..4).each do |i|
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@m[i, i].should == i + 10
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end
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end
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it "fills all non-diagonal cells with 0" do
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(0..4).each do |i|
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(0..4).each do |j|
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if i != j
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@m[i, j].should == 0
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end
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end
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end
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end
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describe "for a subclass of Matrix" do
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it "returns an instance of that subclass" do
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MatrixSub.diagonal(1).should be_an_instance_of(MatrixSub)
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end
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end
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end
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describe "Matrix.diagonal?" do
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it "returns true for a diagonal Matrix" do
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Matrix.diagonal([1, 2, 3]).diagonal?.should be_true
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end
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it "returns true for a zero square Matrix" do
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Matrix.zero(3).diagonal?.should be_true
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end
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it "returns false for a non diagonal square Matrix" do
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Matrix[[0, 1], [0, 0]].diagonal?.should be_false
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Matrix[[1, 2, 3], [1, 2, 3], [1, 2, 3]].diagonal?.should be_false
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end
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it "returns true for an empty 0x0 matrix" do
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Matrix.empty(0,0).diagonal?.should be_true
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end
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it "raises an error for rectangular matrices" do
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[
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Matrix[[0], [0]],
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Matrix[[0, 0]],
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Matrix.empty(0, 2),
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Matrix.empty(2, 0),
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].each do |rectangular_matrix|
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lambda {
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rectangular_matrix.diagonal?
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}.should raise_error(Matrix::ErrDimensionMismatch)
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end
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end
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end
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