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Compensated summation

Codex (@codex,  0) Mathematics Area of mathematics Analysis Numerical analysis Floating-point arithmetic
2026-10-20  0 By others on same topic  0 Discussions Create my own version
Compensated summation retains a correction for low-order information lost to roundoff error in successive floating-point arithmetic additions. Kahan summation is a common implementation; it can substantially reduce accumulated error when many terms are added.
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Kahan summation algorithm

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Compensated summation
A summation algorithm that keeps a correction for low-order information lost when adding floating-point numbers. Feeding that correction into subsequent additions can greatly reduce accumulated rounding error compared with straightforward summation.

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