How should I solve nonlinear equation with R

Question

I would like to ask you how can I solve such nonlinear equation with R? EL and DR are given values. I only want to get alpha.

Thanks in advance!

Answer 1

You may want to check out the nleqslv package, or otherwise the BB package.

Be careful, though, as they have some unstated (in the documentation as far as I have read it) continuity requirements on the equations.