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improve _log1pmx_ker internal documentation on the polynomial #97

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Merged
merged 2 commits into from
Aug 17, 2025
Merged

improve _log1pmx_ker internal documentation on the polynomial #97

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60a80b5
improve `_log1pmx_ker` internal documentation on the polynomial
nsajko Jul 30, 2025
a81f2b6
implement suggestion
nsajko Aug 9, 2025
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5 changes: 5 additions & 0 deletions src/basicfuns.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -353,6 +353,11 @@ function _log1pmx_ker(x::T) where T <: Union{Float32, Float64}
0.11201972567415432,
0.143418239946679)
end
# Mathematically equivalent to:
#
# ```julia
# w = 2 * (atanh(r) - r) / r^3
# ```
w = evalpoly(t, p)
hxsq = x*x/2
muladd(r, muladd(w, t, hxsq), -hxsq)
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