[New-bugs-announce] [issue43088] Regression in math.hypot

Charles Karney report at bugs.python.org
Sun Jan 31 17:33:45 EST 2021

New submission from Charles Karney <charles at karney.com>:

It would be nice if math.hypot had the property

  0 < y1 < y2
  math.hypot(x, y1) <= math.hypot(x, y2)

This is not the case in python3 with

  x  = 0.6102683302836215
  y1 = 0.7906090004346522
  y2 = y1 + 1e-16

python2's implementation of math.hypot is OK with these inputs.

components: Library (Lib)
files: hypot_bug.py
messages: 386043
nosy: cffk
priority: normal
severity: normal
status: open
title: Regression in math.hypot
type: behavior
versions: Python 3.9
Added file: https://bugs.python.org/file49783/hypot_bug.py

Python tracker <report at bugs.python.org>

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