1Blurb::
2X-convergence tolerance
3Description::
4\c x_conv_tol maps to the internal NL2SOL control \c xctol.
5It is the X-convergence tolerance (scaled relative
6accuracy of the solution variables).
7
8The internal default is a function of machine epsilon
9(as limited by \c function_precision). The default is selected with a value of -1.
10
11Topics::
12Examples::
13Theory::
14Faq::
15See_Also::
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