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clarify that z should not be in the domain

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kevaundray
2022-12-14 11:01:40 +00:00
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parent a57e156360
commit e467ab9556
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specs/eip4844/polynomial-commitments.md
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@@ -293,7 +293,7 @@ def compute_powers(x: BLSFieldElement, n: uint64) -> Sequence[BLSFieldElement]:
def evaluate_polynomial_in_evaluation_form(polynomial: Polynomial,
z: BLSFieldElement) -> BLSFieldElement:
"""
Evaluate a polynomial (in evaluation form) at an arbitrary point ``z``.
Evaluate a polynomial (in evaluation form) at an arbitrary point ``z`` that is not in the domain.
Uses the barycentric formula:
f(z) = (z**WIDTH - 1) / WIDTH * sum_(i=0)^WIDTH (f(DOMAIN[i]) * DOMAIN[i]) / (z - DOMAIN[i])
"""