X-convergence tolerance
Specification
Alias: None
Arguments: 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.
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