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require_relative '../../spec_helper'
require_relative 'fixtures/classes'
require 'matrix'
describe "Matrix.columns" do
before :each do
@a = [1, 2]
@b = [3, 4]
@m = Matrix.columns([@a, @b])
end
it "creates a Matrix from argument columns" do
@m.should be_an_instance_of(Matrix)
@m.column(0).to_a.should == @a
@m.column(1).to_a.should == @b
end
it "accepts Vectors as argument columns" do
m = Matrix.columns([Vector[*@a], Vector[*@b]])
m.should == @m
m.column(0).to_a.should == @a
m.column(1).to_a.should == @b
end
it "handles empty matrices" do
e = Matrix.columns([])
e.row_size.should == 0
e.column_size.should == 0
e.should == Matrix[]
v = Matrix.columns([[],[],[]])
v.row_size.should == 0
v.column_size.should == 3
v.should == Matrix[[], [], []].transpose
end
describe "for a subclass of Matrix" do
it "returns an instance of that subclass" do
MatrixSub.columns([[1]]).should be_an_instance_of(MatrixSub)
end
end
end
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