[136] | 1 | // This file is part of Eigen, a lightweight C++ template library
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| 2 | // for linear algebra.
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| 3 | //
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| 4 | // Copyright (C) 2009-2010 Gael Guennebaud <gael.guennebaud@inria.fr>
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| 5 | //
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| 6 | // This Source Code Form is subject to the terms of the Mozilla
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| 7 | // Public License v. 2.0. If a copy of the MPL was not distributed
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| 8 | // with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
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| 9 |
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| 10 | #include "common.h"
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| 11 |
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| 12 | // computes the sum of magnitudes of all vector elements or, for a complex vector x, the sum
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| 13 | // res = |Rex1| + |Imx1| + |Rex2| + |Imx2| + ... + |Rexn| + |Imxn|, where x is a vector of order n
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| 14 | RealScalar EIGEN_BLAS_FUNC(asum)(int *n, RealScalar *px, int *incx)
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| 15 | {
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| 16 | // std::cerr << "_asum " << *n << " " << *incx << "\n";
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| 17 |
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| 18 | Scalar* x = reinterpret_cast<Scalar*>(px);
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| 19 |
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| 20 | if(*n<=0) return 0;
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| 21 |
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| 22 | if(*incx==1) return vector(x,*n).cwiseAbs().sum();
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| 23 | else return vector(x,*n,std::abs(*incx)).cwiseAbs().sum();
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| 24 | }
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| 25 |
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| 26 | // computes a vector-vector dot product.
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| 27 | Scalar EIGEN_BLAS_FUNC(dot)(int *n, RealScalar *px, int *incx, RealScalar *py, int *incy)
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| 28 | {
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| 29 | // std::cerr << "_dot " << *n << " " << *incx << " " << *incy << "\n";
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| 30 |
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| 31 | if(*n<=0) return 0;
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| 32 |
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| 33 | Scalar* x = reinterpret_cast<Scalar*>(px);
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| 34 | Scalar* y = reinterpret_cast<Scalar*>(py);
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| 35 |
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| 36 | if(*incx==1 && *incy==1) return (vector(x,*n).cwiseProduct(vector(y,*n))).sum();
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| 37 | else if(*incx>0 && *incy>0) return (vector(x,*n,*incx).cwiseProduct(vector(y,*n,*incy))).sum();
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| 38 | else if(*incx<0 && *incy>0) return (vector(x,*n,-*incx).reverse().cwiseProduct(vector(y,*n,*incy))).sum();
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| 39 | else if(*incx>0 && *incy<0) return (vector(x,*n,*incx).cwiseProduct(vector(y,*n,-*incy).reverse())).sum();
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| 40 | else if(*incx<0 && *incy<0) return (vector(x,*n,-*incx).reverse().cwiseProduct(vector(y,*n,-*incy).reverse())).sum();
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| 41 | else return 0;
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| 42 | }
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| 43 |
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| 44 | // computes the Euclidean norm of a vector.
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| 45 | // FIXME
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| 46 | Scalar EIGEN_BLAS_FUNC(nrm2)(int *n, RealScalar *px, int *incx)
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| 47 | {
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| 48 | // std::cerr << "_nrm2 " << *n << " " << *incx << "\n";
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| 49 | if(*n<=0) return 0;
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| 50 |
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| 51 | Scalar* x = reinterpret_cast<Scalar*>(px);
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| 52 |
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| 53 | if(*incx==1) return vector(x,*n).stableNorm();
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| 54 | else return vector(x,*n,std::abs(*incx)).stableNorm();
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| 55 | }
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| 56 |
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| 57 | int EIGEN_BLAS_FUNC(rot)(int *n, RealScalar *px, int *incx, RealScalar *py, int *incy, RealScalar *pc, RealScalar *ps)
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| 58 | {
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| 59 | // std::cerr << "_rot " << *n << " " << *incx << " " << *incy << "\n";
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| 60 | if(*n<=0) return 0;
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| 61 |
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| 62 | Scalar* x = reinterpret_cast<Scalar*>(px);
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| 63 | Scalar* y = reinterpret_cast<Scalar*>(py);
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| 64 | Scalar c = *reinterpret_cast<Scalar*>(pc);
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| 65 | Scalar s = *reinterpret_cast<Scalar*>(ps);
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| 66 |
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| 67 | StridedVectorType vx(vector(x,*n,std::abs(*incx)));
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| 68 | StridedVectorType vy(vector(y,*n,std::abs(*incy)));
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| 69 |
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| 70 | Reverse<StridedVectorType> rvx(vx);
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| 71 | Reverse<StridedVectorType> rvy(vy);
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| 72 |
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| 73 | if(*incx<0 && *incy>0) internal::apply_rotation_in_the_plane(rvx, vy, JacobiRotation<Scalar>(c,s));
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| 74 | else if(*incx>0 && *incy<0) internal::apply_rotation_in_the_plane(vx, rvy, JacobiRotation<Scalar>(c,s));
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| 75 | else internal::apply_rotation_in_the_plane(vx, vy, JacobiRotation<Scalar>(c,s));
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| 76 |
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| 77 |
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| 78 | return 0;
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| 79 | }
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| 80 |
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| 81 | /*
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| 82 | // performs rotation of points in the modified plane.
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| 83 | int EIGEN_BLAS_FUNC(rotm)(int *n, RealScalar *px, int *incx, RealScalar *py, int *incy, RealScalar *param)
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| 84 | {
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| 85 | Scalar* x = reinterpret_cast<Scalar*>(px);
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| 86 | Scalar* y = reinterpret_cast<Scalar*>(py);
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| 87 |
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| 88 | // TODO
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| 89 |
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| 90 | return 0;
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| 91 | }
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| 92 |
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| 93 | // computes the modified parameters for a Givens rotation.
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| 94 | int EIGEN_BLAS_FUNC(rotmg)(RealScalar *d1, RealScalar *d2, RealScalar *x1, RealScalar *x2, RealScalar *param)
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| 95 | {
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| 96 | // TODO
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| 97 |
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| 98 | return 0;
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| 99 | }
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| 100 | */
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