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Axect / puruspe Public

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Implement the Gamma function with very low relative error#47

Merged

Axect merged 36 commits intoAxect:masterAxect/puruspe:masterfrom

JSorngard:fukushima_gammaJSorngard/puruspe:fukushima_gammaCopy head branch name to clipboard

Feb 6, 2026

Conversation Commits36 (36)Checks Files changed

Merged

Implement the Gamma function with very low relative error#47
Axect merged 36 commits intoAxect:masterfrom
JSorngard:fukushima_gamma

Commits

Commits on Oct 31, 2025

Implement the Gamma function by Toshio Fukushima that has very low relative error.
JSorngard
committed
Merge branch 'master' into fukushima_gamma
JSorngard
committed
Check strictly < 0 since we have already checked that x is not 0
JSorngard
committed
Make the tests stricter
JSorngard
committed
Remove unnecessary line in doc-comment
JSorngard
committed
`cargo fmt`
JSorngard
committed
Explain handling of x -negative int
JSorngard
committed
Fix clippy lints
JSorngard
committed
Set the expected answer in the test og Gamma(-1.5) to the exact correct answer
JSorngard
committed
cargo fmt
JSorngard
committed
Implement the `polynomial` function in terms of `IntoIterator` instead of a const N array.
JSorngard
committed
Rename input to `z`
JSorngard
committed
Make the Gamma function give NaN for NaN inputs
JSorngard
committed
Also test an input of -inf
JSorngard
committed
Comment the special cases also in the tests
JSorngard
committed
Better grammar in comment
JSorngard
committed
Make link in comment easier to just copy paste
JSorngard
committed
Use correct name of input in comment
JSorngard
committed

Commits on Nov 3, 2025

Add a test at `f64::MIN_POSITIVE`
JSorngard
committed
`cargo fmt`
JSorngard
committed
Remove a comma
JSorngard
committed
It even gets it exactly right!
JSorngard
committed
Add comment with source
JSorngard
committed
Add back the relative equality
JSorngard
committed
Move test to be in a groups with all other similar tests
JSorngard
committed
Test some more integer factorials
JSorngard
committed
Specialize on integers and calculate Gamma(integer) with factorial
JSorngard
committed

Commits on Nov 7, 2025

Use fused multiply-add instructions in `polynomial` if they are available
JSorngard
authored
Correct unclosed paren
JSorngard
authored
Fix some whitespace
JSorngard
authored
Remove a newline
JSorngard
authored

Commits on Nov 12, 2025

Add a doc-example to `polynomial`
JSorngard
committed
`cargo fmt`
JSorngard
committed
Remove the doc-example since the function is not public
JSorngard
committed
Re-add the explanatory comment
JSorngard
committed
Remove comment that was moved to github PR
JSorngard
committed

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