// This file is part of Eigen, a lightweight C++ template library // for linear algebra. // // Copyright (C) 2010-2011 Gael Guennebaud <gael.guennebaud@inria.fr> // // This Source Code Form is subject to the terms of the Mozilla // Public License v. 2.0. If a copy of the MPL was not distributed // with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
// POTRF computes the Cholesky factorization of a real symmetric positive definite matrix A.
EIGEN_LAPACK_FUNC(potrf,(char* uplo, int *n, RealScalar *pa, int *lda, int *info))
{
*info = 0; if(UPLO(*uplo)==INVALID) *info = -1; elseif(*n<0) *info = -2; elseif(*lda<std::max(1,*n)) *info = -4; if(*info!=0)
{ int e = -*info; return xerbla_(SCALAR_SUFFIX_UP"POTRF", &e, 6);
}
Scalar* a = reinterpret_cast<Scalar*>(pa);
MatrixType A(a,*n,*n,*lda); int ret; if(UPLO(*uplo)==UP) ret = int(internal::llt_inplace<Scalar, Upper>::blocked(A)); else ret = int(internal::llt_inplace<Scalar, Lower>::blocked(A));
if(ret>=0)
*info = ret+1;
return 0;
}
// POTRS solves a system of linear equations A*X = B with a symmetric // positive definite matrix A using the Cholesky factorization // A = U**T*U or A = L*L**T computed by DPOTRF.
EIGEN_LAPACK_FUNC(potrs,(char* uplo, int *n, int *nrhs, RealScalar *pa, int *lda, RealScalar *pb, int *ldb, int *info))
{
*info = 0; if(UPLO(*uplo)==INVALID) *info = -1; elseif(*n<0) *info = -2; elseif(*nrhs<0) *info = -3; elseif(*lda<std::max(1,*n)) *info = -5; elseif(*ldb<std::max(1,*n)) *info = -7; if(*info!=0)
{ int e = -*info; return xerbla_(SCALAR_SUFFIX_UP"POTRS", &e, 6);
}
Scalar* a = reinterpret_cast<Scalar*>(pa);
Scalar* b = reinterpret_cast<Scalar*>(pb);
MatrixType A(a,*n,*n,*lda);
MatrixType B(b,*n,*nrhs,*ldb);
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