LA_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_syamv (uplo, n, alpha, a, lda, x, incx, beta, y, incy) |
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| | la_cla_syamv |
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| subroutine | dla_syamv (uplo, n, alpha, a, lda, x, incx, beta, y, incy) |
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| | la_dla_syamv |
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| | la_qla_syamv |
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| subroutine | sla_syamv (uplo, n, alpha, a, lda, x, incx, beta, y, incy) |
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| | la_sla_syamv |
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| | la_wla_syamv |
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| subroutine | zla_syamv (uplo, n, alpha, a, lda, x, incx, beta, y, incy) |
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| | la_zla_syamv |
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LA_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_syamv()
| subroutine la_lapack::la_syamv::cla_syamv |
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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 ) |
◆ dla_syamv()
| subroutine la_lapack::la_syamv::dla_syamv |
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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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real(dp), dimension(lda,*), intent(in) | a, |
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integer(ilp), intent(in) | lda, |
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real(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 ) |
◆ la_cla_syamv()
| la_lapack::la_syamv::la_cla_syamv |
◆ la_dla_syamv()
| la_lapack::la_syamv::la_dla_syamv |
◆ la_qla_syamv()
| la_lapack::la_syamv::la_qla_syamv |
◆ la_sla_syamv()
| la_lapack::la_syamv::la_sla_syamv |
◆ la_wla_syamv()
| la_lapack::la_syamv::la_wla_syamv |
◆ la_zla_syamv()
| la_lapack::la_syamv::la_zla_syamv |
◆ sla_syamv()
| subroutine la_lapack::la_syamv::sla_syamv |
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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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real(sp), dimension(lda,*), intent(in) | a, |
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integer(ilp), intent(in) | lda, |
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real(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 ) |
◆ zla_syamv()
| subroutine la_lapack::la_syamv::zla_syamv |
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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 ) |
The documentation for this interface was generated from the following file:
