Check failed in file d:\lib\boost_1_34_1\boost\numeric\ublas\lu.hpp at line 272:
detail::expression_type_check (prod (triangular_adaptor<const_matrix_type, upper (m), e), cv2)


This error is usually triggered when the matrix is ill conditioned

(nearly singular). Then the internal checks fail because the result

depends on the order of the floating point operations.

There are several solutions possible:

* disable debugging (define NDEBUG)

* disable type checks (see [1], keyword: BOOST_UBLAS_TYPE_CHECK)

* use a better solver (see

Re: lu_substitute’s “internal logic” error – msg#00034 – lib.boost.ublas

解が浮動小数点演算の桁に依存するためにinternal checkに失敗するのがエラーの原因だらしい。




#define NDEBUG



BOOST_UBLAS_TYPE_CHECK Enable additional checks for the results of expressions using non dense types. Picks up runtime error such as the assignment of a numerically non-symmetric matrix to symmertic_matrix. Use #define BOOST_UBLAS_TYPE_CHECK 0 to disable expensive numeric type checks. (Note: “structure check” would be a much better name.)


uBLAS examplesのExample2とかExample6とか


template <typename T>
matrix<T> inv(const matrix<T>& m)
throw (std::invalid_argument) {
	typedef matrix<T> m_t;
	m_t a(m);
	m_t b(identity_matrix<T>(m.size1()));
	permutation_matrix<std::size_t> pm(m.size1());

	if (lu_factorize(a,pm) != 0)
	    throw std::invalid_argument(std::string("No inverse exists."));


	return b;

BOOST_USER: LU Matrix Inversionのパクリ。


throw std::invalid_argumentの使い方がこれであっているのか自信ない。


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