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This is designed for use with an arbitrary set of equations with an arbitrary set of unknowns. The user selects "fixed" values for enough unknowns to leave as many variables as there are equations, which in most cases means the system is properly defined and a unique solution exists. The function, the fixed values and initial values for the remaining unknowns are fed to a nonlinear backsolver. The original version of "TK!Solver" , now a product of Universal Technical Systems (<https://www.uts.com>) was the inspiration for this function.
Package details 


Author  Carl Witthoft 
Maintainer  Carl Witthoft <carl@witthoft.com> 
License  LGPL3 
Version  1.3 
Package repository  View on CRAN 
Installation 
Install the latest version of this package by entering the following in R:

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