diff options
| author |  Gael Guennebaud <g.gael@free.fr> | 2013-10-01 22:37:10 +0200 |
|---|---|---|
| committer | Gael Guennebaud <g.gael@free.fr> | 2013-10-01 22:37:10 +0200 |
| commit | 446320b226c152ced3e42dbff08049a3f82ffee7 (patch) | |
| tree | f3ff34ee57459e06f4f2716ca861ac84c0186967 /blas | |
| parent | 54e576c88af67aa2c8a66d95a104a4ffc5fd1985 (diff) | |
Fix dot*w to return 0 for empty vectors (BLAS interface)
Diffstat (limited to 'blas')
| -rw-r--r-- | blas/level1_cplx_impl.h | 18 |
1 files changed, 12 insertions, 6 deletions
diff --git a/blas/level1_cplx_impl.h b/blas/level1_cplx_impl.h index 283b9f827..ffe192481 100644 --- a/blas/level1_cplx_impl.h +++ b/blas/level1_cplx_impl.h @@ -39,13 +39,16 @@ RealScalar EIGEN_CAT(EIGEN_CAT(REAL_SCALAR_SUFFIX,SCALAR_SUFFIX),asum_)(int *n, // computes a dot product of a conjugated vector with another vector. int EIGEN_BLAS_FUNC(dotcw)(int *n, RealScalar *px, int *incx, RealScalar *py, int *incy, RealScalar* pres) { -// std::cerr << "_dotc " << *n << " " << *incx << " " << *incy << "\n"; + Scalar* res = reinterpret_cast<Scalar*>(pres); - if(*n<=0) return 0; + if(*n<=0) + { + *res = Scalar(0); + return 0; + } Scalar* x = reinterpret_cast<Scalar*>(px); Scalar* y = reinterpret_cast<Scalar*>(py); - Scalar* res = reinterpret_cast<Scalar*>(pres); if(*incx==1 && *incy==1) *res = (vector(x,*n).dot(vector(y,*n))); else if(*incx>0 && *incy>0) *res = (vector(x,*n,*incx).dot(vector(y,*n,*incy))); @@ -58,13 +61,16 @@ int EIGEN_BLAS_FUNC(dotcw)(int *n, RealScalar *px, int *incx, RealScalar *py, in // computes a vector-vector dot product without complex conjugation. int EIGEN_BLAS_FUNC(dotuw)(int *n, RealScalar *px, int *incx, RealScalar *py, int *incy, RealScalar* pres) { -// std::cerr << "_dotu " << *n << " " << *incx << " " << *incy << "\n"; + Scalar* res = reinterpret_cast<Scalar*>(pres); - if(*n<=0) return 0; + if(*n<=0) + { + *res = Scalar(0); + return 0; + } Scalar* x = reinterpret_cast<Scalar*>(px); Scalar* y = reinterpret_cast<Scalar*>(py); - Scalar* res = reinterpret_cast<Scalar*>(pres); if(*incx==1 && *incy==1) *res = (vector(x,*n).cwiseProduct(vector(y,*n))).sum(); else if(*incx>0 && *incy>0) *res = (vector(x,*n,*incx).cwiseProduct(vector(y,*n,*incy))).sum(); |