root / synthbench / euroben-dm / mod2b / ger.f @ 0:839f52ef7657
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Subroutine ger( m, n, alpha, x, incx, y, incy, a, lda ) |
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! ----------------------------------------------------------------------- |
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Use numerics |
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Implicit None |
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|
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Real(l_) :: alpha |
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Integer :: incx, incy, lda, m, n |
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Real(l_) :: a(lda,*), x(*), y(*) |
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Real(l_) :: temp |
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Integer :: i, info, ix, j, jy, kx |
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! ----------------------------------------------------------------------- |
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info = 0 |
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If (m < 0 ) Then |
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info = 1 |
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Else If ( n < 0 ) Then |
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info = 2 |
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Else If ( incx == 0 ) Then |
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info = 5 |
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Else If ( incy == 0 ) Then |
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Info = 7 |
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Else If ( lda < Max( 1, m ) ) Then |
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Info = 9 |
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End If |
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If ( Info /= 0 ) Then |
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Call xerbla( 'GER ', info ) |
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Return |
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End If |
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If ( ( m == 0 ) .OR. ( n == 0 ) .OR. ( alpha == 0.0_l_ ) ) Return |
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If ( incy > 0 ) Then |
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jy = 1 |
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Else |
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jy = 1 - (n-1)*incy |
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End If |
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If ( incx == 1 ) Then |
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Do j = 1, n |
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If ( y(jy) /= 0.0_l_ ) Then |
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temp = alpha*y(jy) |
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Do i = 1, m |
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a(i,j) = a(i,j) + x(i)*temp |
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End Do |
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End If |
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jy = jy + incy |
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End Do |
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Else |
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If ( incx > 0 ) Then |
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kx = 1 |
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Else |
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kx = 1 - (m-1)*incx |
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End If |
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Do j = 1, n |
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If ( y(jy) /= 0.0_l_ ) Then |
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temp = alpha*y(jy) |
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ix = kx |
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Do i = 1, m |
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a(i,j) = a(i,j) + x(ix)*temp |
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ix = ix + incx |
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End Do |
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End If |
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jy = jy + incy |
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End Do |
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End If |
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! ----------------------------------------------------------------------- |
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End Subroutine ger |