[Help-gsl] computing nth root of beta tan(beta) = L

[Levi Waldron]

Is there a GSL function for computing the nth positive root of
beta*tan(beta) = L for arbitrary values of L?  I couldn't find it in the
manual, but not all special functions give their specifications in the
manual and I don't know what this equation is called.  It is used in the
plane sheet solution of the heat/diffusion equation with type II (Neumann)
boundary condition.

-- 
Levi Waldron, PhD
Treated Wood Research Group
Faculty of Forestry, University of Toronto
33 Willcocks Street, Toronto ON, M5S 3B3 CANADA
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