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Diffstat (limited to 'pl/math/tools/erfc.sollya')
-rw-r--r-- | pl/math/tools/erfc.sollya | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/pl/math/tools/erfc.sollya b/pl/math/tools/erfc.sollya new file mode 100644 index 0000000..8c40b4b --- /dev/null +++ b/pl/math/tools/erfc.sollya @@ -0,0 +1,23 @@ +// polynomial for approximating erfc(x)*exp(x*x) +// +// Copyright (c) 2022-2023, Arm Limited. +// SPDX-License-Identifier: MIT OR Apache-2.0 WITH LLVM-exception + +deg = 12; // poly degree + +// interval bounds +a = 0x1.60dfc14636e2ap0; +b = 0x1.d413cccfe779ap0; + +f = proc(y) { + t = y + a; + return erfc(t) * exp(t*t); +}; + +poly = remez(f(x), deg, [0;b-a], 1, 1e-16); + +display = hexadecimal; +print("rel error:", accurateinfnorm(1-poly(x)/f(x), [a;b], 30)); +print("in [",a,b,"]"); +print("coeffs:"); +for i from 0 to deg do round(coeff(poly,i), 52, RN); |