POEQU: computes row and column scalings intended to equilibrate a Hermitian positive definite matrix A and reduce its condition number (with respect to the two-norm). S contains the scale factors, S(i) = 1/sqrt(A(i,i)), chosen so that the scaled matrix B with elements B(i,j) = S(i)*A(i,j)*S(j) has ones on the diagonal. This choice of S puts the condition number of B within a factor N of the smallest possible condition number over all possible diagonal scalings.
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| pure subroutine | cpoequ (n, a, lda, s, scond, amax, info) |
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| | la_cpoequ |
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| pure subroutine | dpoequ (n, a, lda, s, scond, amax, info) |
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| | la_dpoequ |
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| | la_qpoequ |
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| pure subroutine | spoequ (n, a, lda, s, scond, amax, info) |
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| | la_spoequ |
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| | la_wpoequ |
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| pure subroutine | zpoequ (n, a, lda, s, scond, amax, info) |
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| | la_zpoequ |
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POEQU: computes row and column scalings intended to equilibrate a Hermitian positive definite matrix A and reduce its condition number (with respect to the two-norm). S contains the scale factors, S(i) = 1/sqrt(A(i,i)), chosen so that the scaled matrix B with elements B(i,j) = S(i)*A(i,j)*S(j) has ones on the diagonal. This choice of S puts the condition number of B within a factor N of the smallest possible condition number over all possible diagonal scalings.
◆ cpoequ()
| pure subroutine la_lapack::poequ::cpoequ |
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integer(ilp), intent(in) | n, |
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complex(sp), dimension(lda,*), intent(in) | a, |
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integer(ilp), intent(in) | lda, |
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real(sp), dimension(*), intent(out) | s, |
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real(sp), intent(out) | scond, |
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real(sp), intent(out) | amax, |
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integer(ilp), intent(out) | info ) |
◆ dpoequ()
| pure subroutine la_lapack::poequ::dpoequ |
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integer(ilp), intent(in) | n, |
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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(out) | s, |
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real(dp), intent(out) | scond, |
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real(dp), intent(out) | amax, |
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integer(ilp), intent(out) | info ) |
◆ la_cpoequ()
| la_lapack::poequ::la_cpoequ |
◆ la_dpoequ()
| la_lapack::poequ::la_dpoequ |
◆ la_qpoequ()
| la_lapack::poequ::la_qpoequ |
◆ la_spoequ()
| la_lapack::poequ::la_spoequ |
◆ la_wpoequ()
| la_lapack::poequ::la_wpoequ |
◆ la_zpoequ()
| la_lapack::poequ::la_zpoequ |
◆ spoequ()
| pure subroutine la_lapack::poequ::spoequ |
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integer(ilp), intent(in) | n, |
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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(out) | s, |
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real(sp), intent(out) | scond, |
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real(sp), intent(out) | amax, |
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integer(ilp), intent(out) | info ) |
◆ zpoequ()
| pure subroutine la_lapack::poequ::zpoequ |
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integer(ilp), intent(in) | n, |
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complex(dp), dimension(lda,*), intent(in) | a, |
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integer(ilp), intent(in) | lda, |
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real(dp), dimension(*), intent(out) | s, |
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real(dp), intent(out) | scond, |
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real(dp), intent(out) | amax, |
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integer(ilp), intent(out) | info ) |
The documentation for this interface was generated from the following file:
