koblas
com.eignex.koblas/Factorization.kt

lapackFailedAt

fun lapackFailedAt(info: Int): Int(source)

Translates a LAPACK info return into a failedAt position. A positive info is the 1-based pivot index; a negative one is an illegal-argument report and maps to NOT_SINGULAR.

NOT_SINGULAR

const val NOT_SINGULAR: Int(source)

The failedAt value of a factorization that succeeded, dense or sparse.

SINGULAR_POSITION_UNKNOWN

const val SINGULAR_POSITION_UNKNOWN: Int(source)

A failedAt meaning "singular, but this backend cannot say where". Exists so a host solver like UMFPACK, which counts zero pivots without locating them, need not invent a position or report NOT_SINGULAR.