Dakota Reference Manual  Version 6.4
Large-Scale Engineering Optimization and Uncertainty Analysis
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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.