Routines for Estimating the Condition Number

?gecon estimates the reciprocal of the condition number of a general matrix in either the 1-norm or the infinity-norm.
call sgecon (norm, n, a, lda, anorm, rcond, work, iwork, info) call dgecon (norm, n, a, lda, anorm, rcond, work, iwork, info) call cgecon (norm, n, a, lda, anorm, rcond, work, rwork, info) call zgecon (norm, n, a, lda, anorm, rcond, work, rwork, info)

?gbcon estimates the reciprocal of the condition number of a band matrix in either the 1-norm or the infinity-norm.
call sgbcon (norm, n, kl, ku, ab, ldab, ipiv, anorm, rcond, work, iwork, info) call dgbcon (norm, n, kl, ku, ab, ldab, ipiv, anorm, rcond, work, iwork, info) call cgbcon (norm, n, kl, ku, ab, ldab, ipiv, anorm, rcond, work, rwork, info) call zgbcon (norm, n, kl, ku, ab, ldab, ipiv, anorm, rcond, work, rwork, info)

?gtcon estimates the reciprocal of the condition number of a tridiagonal matrix using the factorization computed by ?gttrf.
call sgtcon (norm, n, dl, d, du, du2, ipiv, anorm, rcond, work, iwork, info) call dgtcon (norm, n, dl, d, du, du2, ipiv, anorm, rcond, work, iwork, info) call cgtcon (norm, n, dl, d, du, du2, ipiv, anorm, rcond, work, info) call zgtcon (norm, n, dl, d, du, du2, ipiv, anorm, rcond, work, info)

?pocon estimates the reciprocal of the condition number of a symmetric (Hermitian) positive-definite matrix.
call spocon (uplo, n, a, lda, anorm, rcond, work, iwork, info) call dpocon (uplo, n, a, lda, anorm, rcond, work, iwork, info) call cpocon (uplo, n, a, lda, anorm, rcond, work, rwork, info) call zpocon (uplo, n, a, lda, anorm, rcond, work, rwork, info)

?ppcon estimates the reciprocal of the condition number of a packed symmetric (Hermitian) positive-definite matrix.
call sppcon (uplo, n, ap, anorm, rcond, work, iwork, info) call dppcon (uplo, n, ap, anorm, rcond, work, iwork, info) call cppcon (uplo, n, ap, anorm, rcond, work, rwork, info) call zppcon (uplo, n, ap, anorm, rcond, work, rwork, info)

?pbcon estimates the reciprocal of the condition number of a symmetric (Hermitian) positive-definite band matrix.
call spbcon (uplo, n, kd, ab, ldab, anorm, rcond, work, iwork, info) call dpbcon (uplo, n, kd, ab, ldab, anorm, rcond, work, iwork, info) call cpbcon (uplo, n, kd, ab, ldab, anorm, rcond, work, rwork, info) call zpbcon (uplo, n, kd, ab, ldab, anorm, rcond, work, rwork, info)

?ptcon estimates the reciprocal of the condition number of a symmetric (Hermitian) positive-definite tridiagonal matrix.
call sptcon (n, d, e, anorm, rcond, work, info) call dptcon (n, d, e, anorm, rcond, work, info) call cptcon (n, d, e, anorm, rcond, work, info) call zptcon (n, d, e, anorm, rcond, work, info)

?sycon estimates the reciprocal of the condition number of a symmetric matrix.
call ssycon (uplo, n, a, lda, ipiv, anorm, rcond, work, iwork, info) call dsycon (uplo, n, a, lda, ipiv, anorm, rcond, work, iwork, info) call csycon (uplo, n, a, lda, ipiv, anorm, rcond, work, rwork, info) call zsycon (uplo, n, a, lda, ipiv, anorm, rcond, work, rwork, info)

?hecon estimates the reciprocal of the condition number of a Hermitian matrix.
call checon (uplo, n, a, lda, ipiv, anorm, rcond, work, rwork, info) call zhecon (uplo, n, a, lda, ipiv, anorm, rcond, work, rwork, info)

?spcon estimates the reciprocal of the condition number of a packed symmetric matrix.
call sspcon (uplo, n, ap, ipiv, anorm, rcond, work, iwork, info) call dspcon (uplo, n, ap, ipiv, anorm, rcond, work, iwork, info) call cspcon (uplo, n, ap, ipiv, anorm, rcond, work, rwork, info) call zspcon (uplo, n, ap, ipiv, anorm, rcond, work, rwork, info)

?hpcon estimates the reciprocal of the condition number of a packed Hermitian matrix.
call chpcon (uplo, n, ap, ipiv, anorm, rcond, work, rwork, info) call zhpcon (uplo, n, ap, ipiv, anorm, rcond, work, rwork, info)

?trcon estimates the reciprocal of the condition number of a triangular matrix.
call strcon (norm, uplo, diag, n, a, lda, rcond, work, iwork, info) call dtrcon (norm, uplo, diag, n, a, lda, rcond, work, iwork, info) call ctrcon (norm, uplo, diag, n, a, lda, rcond, work, rwork, info) call ztrcon (norm, uplo, diag, n, a, lda, rcond, work, rwork, info)

?tpcon estimates the reciprocal of the condition number of a packed triangular matrix.
call stpcon (norm, uplo, diag, n, ap, rcond, work, iwork, info) call dtpcon (norm, uplo, diag, n, ap, rcond, work, iwork, info) call ctpcon (norm, uplo, diag, n, ap, rcond, work, rwork, info) call ztpcon (norm, uplo, diag, n, ap, rcond, work, rwork, info)

?tbcon estimates the reciprocal of the condition number of a triangular band matrix.
call stbcon (norm, uplo, diag, n, kd, ab, ldab, rcond, work, iwork, info) call dtbcon (norm, uplo, diag, n, kd, ab, ldab, rcond, work, iwork, info) call ctbcon (norm, uplo, diag, n, kd, ab, ldab, rcond, work, rwork, info) call ztbcon (norm, uplo, diag, n, kd, ab, ldab, rcond, work, rwork, info)