sger.f (3) - Linux Manuals


sger.f -



subroutine sger (M, N, ALPHA, X, INCX, Y, INCY, A, LDA)

Function/Subroutine Documentation

subroutine sger (integerM, integerN, realALPHA, real, dimension(*)X, integerINCX, real, dimension(*)Y, integerINCY, real, dimension(lda,*)A, integerLDA)

SGER Purpose:

 SGER   performs the rank 1 operation

    A := alpha*x*y**T + A,

 where alpha is a scalar, x is an m element vector, y is an n element
 vector and A is an m by n matrix.




          M is INTEGER
           On entry, M specifies the number of rows of the matrix A.
           M must be at least zero.


          N is INTEGER
           On entry, N specifies the number of columns of the matrix A.
           N must be at least zero.


          ALPHA is REAL
           On entry, ALPHA specifies the scalar alpha.


          X is REAL array of dimension at least
           ( 1 + ( m - 1 )*abs( INCX ) ).
           Before entry, the incremented array X must contain the m
           element vector x.


          INCX is INTEGER
           On entry, INCX specifies the increment for the elements of
           X. INCX must not be zero.


          Y is REAL array of dimension at least
           ( 1 + ( n - 1 )*abs( INCY ) ).
           Before entry, the incremented array Y must contain the n
           element vector y.


          INCY is INTEGER
           On entry, INCY specifies the increment for the elements of
           Y. INCY must not be zero.


          A is REAL array of DIMENSION ( LDA, n ).
           Before entry, the leading m by n part of the array A must
           contain the matrix of coefficients. On exit, A is
           overwritten by the updated matrix.


          LDA is INTEGER
           On entry, LDA specifies the first dimension of A as declared
           in the calling (sub) program. LDA must be at least
           max( 1, m ).



Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.


November 2011

Further Details:

  Level 2 Blas routine.

  -- Written on 22-October-1986.
     Jack Dongarra, Argonne National Lab.
     Jeremy Du Croz, Nag Central Office.
     Sven Hammarling, Nag Central Office.
     Richard Hanson, Sandia National Labs.


Definition at line 131 of file sger.f.


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