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require File.expand_path('../../../spec_helper', __FILE__)
require 'matrix'
describe "Matrix#singular?" do
it "returns true for singular matrices" do
m = Matrix[ [1,2,3], [3,4,3], [0,0,0] ]
m.singular?.should be_true
m = Matrix[ [1,2,9], [3,4,9], [1,2,9] ]
m.singular?.should be_true
end
it "returns false if the Matrix is regular" do
Matrix[ [0,1], [1,0] ].singular?.should be_false
end
it "returns false for an empty 0x0 matrix" do
Matrix.empty(0,0).singular?.should be_false
end
it "raises an error for rectangular matrices" do
lambda {
Matrix[[1], [2], [3]].singular?
}.should raise_error(Matrix::ErrDimensionMismatch)
lambda {
Matrix.empty(3,0).singular?
}.should raise_error(Matrix::ErrDimensionMismatch)
end
end
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