singular_conv_tol

Singular convergence tolerance

Specification

  • Alias: None

  • Arguments: REAL

  • Default: -1. (use NL2SOL internal default)

Description

singular_conv_tol (NL2SOL’s sctol) is the singular convergence tolerance, which works in conjunction with method-nl2sol-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 method-nl2sol-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.