JuliaSpaceMissionDesign/IERSConventions.jl

ERA returns NaN with ForwardDiff

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MicheleCeresoli commented

When trying to compute a derivative with ForwardDiff, the iers_era function returns a NaN type, which does not allow the AD computation of the GCRF-to-ITRF rotation

julia> using IERSConventions 
julia> using JSMDUtils.Math: D¹

julia> D¹(t->iers_era(iers2010a, t), 1)
NaN
MicheleCeresoli commented

This is caused by the usage of the mod function:

julia> ForwardDiff.derivative(t->mod(t, 1), 2)
NaN