Golang Syr2示例

示例#1

文件： symmetric.go 项目： magastzheng/matrix

// RankTwo performs a symmmetric rank-two update to the matrix a and stores
// the result in the receiver
//  m = a + alpha * (x * y' + y * x')
func (s *SymDense) RankTwo(a Symmetric, alpha float64, x, y *Vector) {
	n := s.mat.N
	if x.Len() != n {
		panic(matrix.ErrShape)
	}
	if y.Len() != n {
		panic(matrix.ErrShape)
	}
	var w SymDense
	if s == a {
		w = *s
	}
	if w.isZero() {
		w.mat = blas64.Symmetric{
			N:      n,
			Stride: n,
			Uplo:   blas.Upper,
			Data:   use(w.mat.Data, n*n),
		}
	} else if n != w.mat.N {
		panic(matrix.ErrShape)
	}
	if s != a {
		w.CopySym(a)
	}
	blas64.Syr2(alpha, x.mat, y.mat, w.mat)
	*s = w
	return
}

示例#2

文件： symmetric.go 项目： RomainVabre/origin

// RankTwo performs a symmmetric rank-two update to the matrix a and stores
// the result in the receiver
//  m = a + alpha * (x * y' + y * x')
func (s *SymDense) RankTwo(a Symmetric, alpha float64, x, y []float64) {
	n := s.mat.N
	var w SymDense
	if s == a {
		w = *s
	}
	if w.isZero() {
		w.mat = blas64.Symmetric{
			N:      n,
			Stride: n,
			Uplo:   blas.Upper,
			Data:   use(w.mat.Data, n*n),
		}
	} else if n != w.mat.N {
		panic(ErrShape)
	}
	if s != a {
		w.CopySym(a)
	}
	if len(x) != n {
		panic(ErrShape)
	}
	if len(y) != n {
		panic(ErrShape)
	}
	blas64.Syr2(alpha, blas64.Vector{Inc: 1, Data: x}, blas64.Vector{Inc: 1, Data: y}, w.mat)
	*s = w
	return
}

示例#3

文件： symmetric.go 项目： lessc0de/matrix

// RankTwo performs a symmmetric rank-two update to the matrix a and stores
// the result in the receiver
//  m = a + alpha * (x * y' + y * x')
func (s *SymDense) RankTwo(a Symmetric, alpha float64, x, y *Vector) {
	n := s.mat.N
	if x.Len() != n {
		panic(matrix.ErrShape)
	}
	if y.Len() != n {
		panic(matrix.ErrShape)
	}
	var w SymDense
	if s == a {
		w = *s
	}
	w.reuseAs(n)
	if s != a {
		w.CopySym(a)
	}
	blas64.Syr2(alpha, x.mat, y.mat, w.mat)
	*s = w
	return
}

示例#4

文件： symmetric.go 项目： rawlingsj/gofabric8

// RankTwo performs a symmmetric rank-two update to the matrix a and stores
// the result in the receiver
//  m = a + alpha * (x * y' + y * x')
func (s *SymDense) RankTwo(a Symmetric, alpha float64, x, y *Vector) {
	n := s.mat.N
	if x.Len() != n {
		panic(matrix.ErrShape)
	}
	if y.Len() != n {
		panic(matrix.ErrShape)
	}
	var w SymDense
	if s == a {
		w = *s
	}
	w.reuseAs(n)
	if s != a {
		if rs, ok := a.(RawSymmetricer); ok {
			s.checkOverlap(rs.RawSymmetric())
		}
		w.CopySym(a)
	}
	blas64.Syr2(alpha, x.mat, y.mat, w.mat)
	*s = w
	return
}