besselj() problem

[GioeleZambotti]

I have a problem in computing the Bessel function with arguments of types ArbFloat

julia> using ArbNumerics

julia> besselj(ArbFloat(1.2),ArbFloat(2.1))
ERROR: MethodError: no method matching ArbFloat{128}(::ArbReal{128}, ::Int64)
The type `ArbFloat{128}` exists, but no method is defined for this combination of argument types when trying to construct it.

Closest candidates are:
  ArbFloat{P}(::ArbReal{P}) where P
   @ ArbNumerics C:\Users\Gioele\.julia\packages\ArbNumerics\qKOAQ\src\values\intraconvert.jl:77
  ArbFloat{P}(::ArbReal{P}, ::Type{ArbNumerics.UpperBound}) where P
   @ ArbNumerics C:\Users\Gioele\.julia\packages\ArbNumerics\qKOAQ\src\values\intraconvert.jl:79
  ArbFloat{P}(::ArbReal{P}, ::Type{ArbNumerics.LowerBound}) where P
   @ ArbNumerics C:\Users\Gioele\.julia\packages\ArbNumerics\qKOAQ\src\values\intraconvert.jl:87
  ...

Stacktrace:
 [1] besselj(nu::ArbFloat{128}, x::ArbFloat{128}, prec::Int64)
   @ ArbNumerics C:\Users\Gioele\.julia\packages\ArbNumerics\qKOAQ\src\float\bessel.jl:27
 [2] besselj(nu::ArbFloat{128}, x::ArbFloat{128})
   @ ArbNumerics C:\Users\Gioele\.julia\packages\ArbNumerics\qKOAQ\src\float\bessel.jl:27
 [3] top-level scope
   @ REPL[2]:1

Thank you in advance

[JeffreySarnoff]

To work with ArbFloat and ArbReal when initializing from a constant, use the string form of the constant, otherwise you are using the Float64 approximation to the value you intend:

julia> ArbFloat(1.2)
1.199999999999999955591079014993738383054733276367188

julia> ArbFloat("1.2")
1.2

julia> ArbReal(1.2)
1.199999999999999955591079014993738383054733276367188

julia> ArbReal("1.2")
1.2

To work with bessel functions, you should use ArbReal rather than ArbFloat.

julia> nu = ArbReal("1.2")
julia> x = ArbReal("1.2")
julia> besselj(nu, x)
0.415617284145182943641198170303477317
julia> besselj(2, x)
0.15934901834766312687578154700520215918