Dakota Reference Manual: singular_conv_tol

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singular_conv_tol

Singular convergence tolerance

## Specification

Alias: none

Argument(s): REAL

Default: -1. (use NL2SOL internal default)

## Description

`singular_conv_tol` (NL2SOL's `sctol`) is the singular convergence tolerance, which works in conjunction with singular_radius to test for underdetermined least-squares problems (stop when the relative reduction yet possible in the sum of squares appears less then `singular_conv_tol` for steps of scaled length at most singular_radius).

The internal default is a function of machine epsilon (as limited by `function_precision`). The default is selected with a value of -1.