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"nl.formorNULL"
nl.formorNULL, Union class that can have nl.form value or NULL value.
nl.form
A virtual Class: No objects may be created from it.
Union class used in assignment of slots, in nl.fitt.gn, and others. No methods defined with class "nl.formorNULL" in the signature.
Robust Nonlinear Regression, Theories and Methods with Practical Guides for R Packages. Riazoshams et al.
# NOT RUN { showClass("nl.formorNULL") # }
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