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Error Function
Calculate the error function erf(x) and complementary error function erfc(x).
erf(x)
-
erfc(x)
-
erf(x) = (2/√π) ∫₀ˣ e^(−t²) dt
erf(x) ≈ 1 - (a₁t + a₂t² + a₃t³ + a₄t⁴ + a₅t⁵)e^(-x²)
t = 1 / (1 + 0.3275911x)
a₁ = 0.254829592
a₂ = -0.284496736
a₃ = 1.421413741
a₄ = -1.453152027
a₅ = 1.061405429
erfc(x) = 1 - erf(x)
erf(-x) = -erf(x)
Cách sử dụng
Enter x to calculate erf(x) and erfc(x).
- High-precision erf(x)
- erfc(x) = 1 - erf(x)
- Formula display
Trường hợp sử dụng
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