Visible to Intel only — GUID: GUID-BD2E87B3-5FA7-4E0C-88E2-1982AB0773A2
Visible to Intel only — GUID: GUID-BD2E87B3-5FA7-4E0C-88E2-1982AB0773A2
?ger
Performs a rank-1 update of a general matrix.
Syntax
call sger(m, n, alpha, x, incx, y, incy, a, lda)
call dger(m, n, alpha, x, incx, y, incy, a, lda)
call ger(a, x, y [,alpha])
Include Files
- mkl.fi, blas.f90
Description
The ?ger routines perform a matrix-vector operation defined as
A := alpha*x*y'+ A,
where:
alpha is a scalar,
x is an m-element vector,
y is an n-element vector,
A is an m-by-n general matrix.
Input Parameters
- m
-
INTEGER. Specifies the number of rows of the matrix A.
The value of m must be at least zero.
- n
-
INTEGER. Specifies the number of columns of the matrix A.
The value of n must be at least zero.
- alpha
-
REAL for sger
DOUBLE PRECISION for dger
Specifies the scalar alpha.
- x
-
REAL for sger
DOUBLE PRECISION for dger
Array, size at least (1 + (m - 1)*abs(incx)). Before entry, the incremented array x must contain the m-element vector x.
- incx
-
INTEGER. Specifies the increment for the elements of x.
The value of incx must not be zero.
- y
-
REAL for sger
DOUBLE PRECISION for dger
Array, size at least (1 + (n - 1)*abs(incy)). Before entry, the incremented array y must contain the n-element vector y.
- incy
-
INTEGER. Specifies the increment for the elements of y.
The value of incy must not be zero.
- a
-
REAL for sger
DOUBLE PRECISION for dger
Array, size (lda, n).
Before entry, the leading m-by-n part of the array a must contain the matrix of coefficients.
- 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, m).
Output Parameters
- a
-
Overwritten by the updated matrix.
BLAS 95 Interface Notes
Routines in Fortran 95 interface have fewer arguments in the calling sequence than their FORTRAN 77 counterparts. For general conventions applied to skip redundant or reconstructible arguments, see BLAS 95 Interface Conventions.
Specific details for the routine ger interface are the following:
- a
-
Holds the matrix A of size (m,n).
- x
-
Holds the vector with the number of elements m.
- y
-
Holds the vector with the number of elements n.
- alpha
-
The default value is 1.