Tag: numerics

Interview Questions

• Why summing 0.1 ten times misses 1.0, and how to fix it
• Storing money in floats is a bug waiting to reconcile
• The value that is not equal to itself: handling NaN
• When the textbook variance formula returns a negative number
• Why 0.1 + 0.2 != 0.3, and how to compare floats
• When Kahan summation still fails, and Neumaier's fix
• Variance of huge, nearly equal numbers, why the textbook formula blows up
• Pairwise summation, the trick NumPy uses for nearly free accuracy
• A settlement total that is off by a penny, and why floats caused it
• Kahan summation, adding a million small numbers