diff options
author | Chen-Pang He <jdh8@ms63.hinet.net> | 2012-09-08 22:51:40 +0800 |
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committer | Chen-Pang He <jdh8@ms63.hinet.net> | 2012-09-08 22:51:40 +0800 |
commit | 1b8f4164082f82265f8118d89de71bb14d7f0eb6 (patch) | |
tree | 49cec0f3337b37da2851f655754505bdab267cc8 /blas/level2_real_impl.h | |
parent | dac5a8a37dd0e6c4b9e79a3d48d276787f06d8c3 (diff) |
Implement rank-1 update for self-adjoint packed matrices.
Diffstat (limited to 'blas/level2_real_impl.h')
-rw-r--r-- | blas/level2_real_impl.h | 47 |
1 files changed, 43 insertions, 4 deletions
diff --git a/blas/level2_real_impl.h b/blas/level2_real_impl.h index ca4469d7a..735545e2b 100644 --- a/blas/level2_real_impl.h +++ b/blas/level2_real_impl.h @@ -231,10 +231,49 @@ int EIGEN_BLAS_FUNC(syr2)(char *uplo, int *n, RealScalar *palpha, RealScalar *px * where alpha is a real scalar, x is an n element vector and A is an * n by n symmetric matrix, supplied in packed form. */ -// int EIGEN_BLAS_FUNC(spr)(char *uplo, int *n, Scalar *alpha, Scalar *x, int *incx, Scalar *ap) -// { -// return 1; -// } +int EIGEN_BLAS_FUNC(spr)(char *uplo, int *n, Scalar *palpha, Scalar *px, int *incx, Scalar *pap) +{ + typedef void (*functype)(int, Scalar*, const Scalar*, Scalar); + static functype func[2]; + + static bool init = false; + if(!init) + { + for(int k=0; k<2; ++k) + func[k] = 0; + + func[UP] = (internal::selfadjoint_packed_rank1_update<Scalar,int,Upper>::run); + func[LO] = (internal::selfadjoint_packed_rank1_update<Scalar,int,Lower>::run); + + init = true; + } + + Scalar* x = reinterpret_cast<Scalar*>(px); + Scalar* ap = reinterpret_cast<Scalar*>(pap); + Scalar alpha = *reinterpret_cast<Scalar*>(palpha); + + int info = 0; + if(UPLO(*uplo)==INVALID) info = 1; + else if(*n<0) info = 2; + else if(*incx==0) info = 5; + if(info) + return xerbla_(SCALAR_SUFFIX_UP"SPR ",&info,6); + + if(alpha==Scalar(0)) + return 1; + + Scalar* x_cpy = get_compact_vector(x, *n, *incx); + + int code = UPLO(*uplo); + if(code>=2 || func[code]==0) + return 0; + + func[code](*n, ap, x_cpy, alpha); + + if(x_cpy!=x) delete[] x_cpy; + + return 1; +} /** DSPR2 performs the symmetric rank 2 operation * |