module Backports
module Backports::Random::Implementation
module Backports::StdLib
module Comparable
module Enumerable
module ExceptionForMatrix
module File::Constants
module Kernel
module Matrix::CoercionHelper
module Matrix::ConversionHelper
module UnicodeNormalize
class Array
class Backports::Data
class Backports::FilteredQueue
class Backports::FilteredQueue::ClosedQueueError
class Backports::FilteredQueue::Message
class Backports::FilteredQueue::TimeoutError
class Backports::Ractor
class Backports::Ractor::BaseQueue
class Backports::Ractor::Cloner
class Backports::Ractor::ClosedError
class Backports::Ractor::Error
class Backports::Ractor::IncomingQueue
class Backports::Ractor::OutgoingQueue
class Backports::Ractor::RemoteError
class Backports::Random
class Backports::Random::MT19937
class Backports::StdLib::LoadedFeatures
class BasicObject
class Bignum
class Binding
class Class
class ClosedQueueError
class Complex
class Data
class Dir
class Enumerable::Enumerator
class Enumerator
class Enumerator::Chain
class Enumerator::GeneratorBP
class Enumerator::Lazy
class Enumerator::Product
class Enumerator::Yielder
class FalseClass
class File
class Fixnum
class Float
class Hash
class IO
class Integer
class MatchData
class Matrix
class Matrix::EigenvalueDecomposition
class Matrix::LUPDecomposition
class Matrix::Scalar
class Method
class Module
class NilClass
class Numeric
class Object
class OpenStruct
class Prime
class Prime::EratosthenesGenerator
class Prime::EratosthenesSieve
class Prime::Generator23
class Prime::PseudoPrimeGenerator
class Prime::TrialDivision
class Prime::TrialDivisionGenerator
class Proc
class Queue
class Ractor
class Random
class Range
class Regexp
class Set
class StopIteration
class String
class Struct
class Symbol
class Time
class TrueClass
class UnboundMethod
class Vector
class Vector::ZeroVectorError
backports
3.25.3
# singular?
def singular? () @col_size.times do |j| if (@lu[j][j] == 0) return true end end false end