Dakota Reference Manual: x_conv_tol

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x_conv_tol

X-convergence tolerance

## Specification

Alias: none

Argument(s): REAL

Default: -1. (use NL2SOL internal default)

## Description

`x_conv_tol` maps to the internal NL2SOL control `xctol`. It is the X-convergence tolerance (scaled relative accuracy of the solution variables).

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