CLA_SYAMV performs the matrix-vector operation y := alpha*abs(A)*abs(x) + beta*abs(y), where alpha and beta are scalars, x and y are vectors and A is an n by n symmetric matrix. This function is primarily used in calculating error bounds. To protect against underflow during evaluation, components in the resulting vector are perturbed away from zero by (N+1) times the underflow threshold. To prevent unnecessarily large errors for block-structure embedded in general matrices, "symbolically" zero components are not perturbed. A zero entry is considered "symbolic" if all multiplications involved in computing that entry have at least one zero multiplicand.
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| subroutine | cla_heamv (uplo, n, alpha, a, lda, x, incx, beta, y, incy) |
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| | la_cla_heamv |
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| | la_wla_heamv |
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| subroutine | zla_heamv (uplo, n, alpha, a, lda, x, incx, beta, y, incy) |
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| | la_zla_heamv |
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CLA_SYAMV performs the matrix-vector operation y := alpha*abs(A)*abs(x) + beta*abs(y), where alpha and beta are scalars, x and y are vectors and A is an n by n symmetric matrix. This function is primarily used in calculating error bounds. To protect against underflow during evaluation, components in the resulting vector are perturbed away from zero by (N+1) times the underflow threshold. To prevent unnecessarily large errors for block-structure embedded in general matrices, "symbolically" zero components are not perturbed. A zero entry is considered "symbolic" if all multiplications involved in computing that entry have at least one zero multiplicand.
◆ cla_heamv()
| subroutine la_lapack::la_heamv::cla_heamv |
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integer(ilp), intent(in) |
uplo, |
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integer(ilp), intent(in) |
n, |
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real(sp), intent(in) |
alpha, |
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complex(sp), dimension(lda,*), intent(in) |
a, |
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integer(ilp), intent(in) |
lda, |
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complex(sp), dimension(*), intent(in) |
x, |
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integer(ilp), intent(in) |
incx, |
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real(sp), intent(in) |
beta, |
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real(sp), dimension(*), intent(inout) |
y, |
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integer(ilp), intent(in) |
incy |
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◆ la_cla_heamv()
| la_lapack::la_heamv::la_cla_heamv |
◆ la_wla_heamv()
| la_lapack::la_heamv::la_wla_heamv |
◆ la_zla_heamv()
| la_lapack::la_heamv::la_zla_heamv |
◆ zla_heamv()
| subroutine la_lapack::la_heamv::zla_heamv |
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integer(ilp), intent(in) |
uplo, |
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integer(ilp), intent(in) |
n, |
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real(dp), intent(in) |
alpha, |
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complex(dp), dimension(lda,*), intent(in) |
a, |
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integer(ilp), intent(in) |
lda, |
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complex(dp), dimension(*), intent(in) |
x, |
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integer(ilp), intent(in) |
incx, |
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real(dp), intent(in) |
beta, |
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real(dp), dimension(*), intent(inout) |
y, |
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integer(ilp), intent(in) |
incy |
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) |
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The documentation for this interface was generated from the following file:
1.9.8