Visible to Intel only — GUID: GUID-EF13F90B-1F38-4C39-98A4-11CD309CB73D
Visible to Intel only — GUID: GUID-EF13F90B-1F38-4C39-98A4-11CD309CB73D
?syr
Performs the symmetric rank-1 update of a complex symmetric matrix.
Syntax
call csyr( uplo, n, alpha, x, incx, a, lda )
call zsyr( uplo, n, alpha, x, incx, a, lda )
Include Files
- mkl.fi
Description
The routine performs the symmetric rank 1 operation defined as
a := alpha*x*xH + a,
where:
alpha is a complex scalar.
x is an n-element complex vector.
a is an n-by-n complex symmetric matrix.
These routines have their real equivalents in BLAS (see ?syr in Chapter "BLAS and Sparse BLAS Routines").
Input Parameters
- uplo
-
CHARACTER*1. Specifies whether the upper or lower triangular part of the array a is used:
If uplo = 'U' or 'u', then the upper triangular part of the array a is used.
If uplo = 'L' or 'l', then the lower triangular part of the array a is used.
- n
-
INTEGER. Specifies the order of the matrix a. The value of n must be at least zero.
- alpha
-
COMPLEX for csyr
DOUBLE COMPLEX for zsyr
Specifies the scalar alpha.
- x
-
COMPLEX for csyr
DOUBLE COMPLEX for zsyr
Array, size at least (1 + (n - 1)*abs(incx)). Before entry, the incremented array x must contain the n-element vector x.
- incx
-
INTEGER. Specifies the increment for the elements of x. The value of incx must not be zero.
- a
-
COMPLEX for csyr
DOUBLE COMPLEX for zsyr
Array, size (lda, n). Before entry with uplo = 'U' or 'u', the leading n-by-n upper triangular part of the array a must contain the upper triangular part of the symmetric matrix and the strictly lower triangular part of a is not referenced.
Before entry with uplo = 'L' or 'l', the leading n-by-n lower triangular part of the array a must contain the lower triangular part of the symmetric matrix and the strictly upper triangular part of a is not referenced.
- lda
-
INTEGER. Specifies the leading dimension of a as declared in the calling (sub)program. The value of lda must be at least max(1,n).
Output Parameters
- a
-
With uplo = 'U' or 'u', the upper triangular part of the array a is overwritten by the upper triangular part of the updated matrix.
With uplo = 'L' or 'l', the lower triangular part of the array a is overwritten by the lower triangular part of the updated matrix.
- info
-
INTEGER. If info = 0, the execution is successful.
If info < 0, the i-th parameter had an illegal value.
If info = -1011, memory allocation error occurred.