gaoflow 2a82540c1f Expand GAMMAINV bracket so tail quantiles are not clamped ...

GammaBase::calculateInverse fixed its upper bound at alpha*beta*5, so any
GAMMA.INV/GAMMAINV quantile larger than that was clamped to it: e.g.
GAMMAINV(0.9999, 1, 1) returned 5 rather than ~9.2103, breaking the
round-trip GAMMADIST(GAMMAINV(p)) == p.

Grow the upper bound geometrically until it brackets the root. If the CDF
stops increasing first (the series approximation is past its usable range)
keep the original bound instead of expanding into it, which also stops a
probability the series cannot reach from running the bound away.

2026-07-28 12:17:22 +02:00

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Benchmark

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PhpSpreadsheetTests

Expand GAMMAINV bracket so tail quantiles are not clamped

2026-07-28 12:17:22 +02:00

bootstrap.php

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