inc_gamma_upper(0,x) fails

[hsgg]

Calculating the incomplete gamma function with a positive lower bound x=0.5 can fail:

julia> inc_gamma_upper(0.0, 0.5)
ERROR: IncGammaBeta.SpecfunUndefinedError
Stacktrace:
 [1] incGamma(::Float64, ::Float64, ::Bool, ::Bool) at /home/hsgg/.julia/v0.6/IncGammaBeta/src/specfun.jl:173
 [2] inc_gamma_upper(::Float64, ::Float64) at /home/hsgg/.julia/v0.6/IncGammaBeta/src/specfun.jl:695
 [3] macro expansion at ./REPL.jl:97 [inlined]
 [4] (::Base.REPL.##1#2{Base.REPL.REPLBackend})() at ./event.jl:73

With Mathematica I get the result: 0.559774

[jkovacic]

Thanks for the bug report.
The algorithm doesn't handle cases when the first arg. is 0.
Will try to fix it soon.