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require File.dirname(__FILE__) + '/../../spec_helper'
require 'matrix'
describe "Matrix.scalar" do
before(:each) do
@side = 3
@value = 8
@a = Matrix.scalar(@side, @value)
end
it "returns a Matrix" do
@a.class.should == Matrix
end
it "returns a n x n matrix" do
@a.row_size.should == @side
@a.column_size.should == @side
end
it "initializes diagonal to value" do
(0...@a.row_size).each do |i|
@a[i, i].should == @value
end
end
it "initializes all non-diagonal values to 0" do
(0...@a.row_size).each do |i|
(0...@a.column_size).each do |j|
if i != j
@a[i, j].should == 0
end
end
end
end
before(:each) do
@side = 3
@value = 8
@a = Matrix.scalar(@side, @value)
end
it "returns a Matrix" do
@a.class.should == Matrix
end
it "returns a square matrix, where the first argument specifies the side of the square" do
@a.row_size.should == @side
@a.column_size.should == @side
end
it "puts the second argument in all diagonal values" do
(0...@a.row_size).each do |i|
@a[i, i].should == @value
end
end
it "fills all values not on the main diagonal with 0" do
(0...@a.row_size).each do |i|
(0...@a.column_size).each do |j|
if i != j
@a[i, j].should == 0
end
end
end
end
end
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