27.cuBLAS开发指南中文版--cuBLAS中的Level-2函数syr2()

2.6.10. `cublas<t>syr2()`

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cublasStatus_t cublasSsyr2(cublasHandle_t handle, cublasFillMode_t uplo, int n,
                           const float           *alpha, const float           *x, int incx,
                           const float           *y, int incy, float           *A, int lda
cublasStatus_t cublasDsyr2(cublasHandle_t handle, cublasFillMode_t uplo, int n,
                           const double          *alpha, const double          *x, int incx,
                           const double          *y, int incy, double          *A, int lda
cublasStatus_t cublasCsyr2(cublasHandle_t handle, cublasFillMode_t uplo, int n,
                           const cuComplex       *alpha, const cuComplex       *x, int incx,
                           const cuComplex       *y, int incy, cuComplex       *A, int lda
cublasStatus_t cublasZsyr2(cublasHandle_t handle, cublasFillMode_t uplo, int n,
                           const cuDoubleComplex *alpha, const cuDoubleComplex *x, int incx,
                           const cuDoubleComplex *y, int incy, cuDoubleComplex *A, int lda

此函数执行对称 rank-2 更新:

$\alpha (xy^T + yx^T) + A$

其中 A 是以列主序存储的 n*n 对称矩阵，x和y 是向量，而 $\alpha$ 是标量。

Param.	Memory	In/out	Meaning
handle		input	handle to the cuBLAS library context.
uplo		input	indicates if matrix A lower or upper part is stored, the other symmetric part is not referenced and is inferred from the stored elements.
n		input	number of rows and columns of matrix A.
alpha	host or device	input	`<type>` scalar used for multiplication.
A	device	input	`<type>` array of dimension lda x n with lda>=max(1,n).
lda		input	leading dimension of two-dimensional array used to store matrix A.
x	device	input	`<type>` vector with n elements.
incx		input	stride between consecutive elements of x.
y	device	input	`<type>` vector with n elements.
incy		input	stride between consecutive elements of y.

该函数可能返回的错误值及其含义如下所列。

ErrorValue	Meaning
CUBLAS_STATUS_SUCCESS	操作成功完成
CUBLAS_STATUS_NOT_INITIALIZED	库未初始化
CUBLAS_STATUS_INVALID_VALUE	参数 m,n<0 或 incx,incy=0
CUBLAS_STATUS_EXECUTION_FAILED	该功能无法在 GPU 上启动

请参考:
ssyr2, dsyr2

27.cuBLAS开发指南中文版--cuBLAS中的Level-2函数syr2()

2.6.10. cublas<t>syr2()

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2.6.10. `cublas<t>syr2()`