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Diffstat (limited to 'pl/math/tools/tan.sollya')
-rw-r--r-- | pl/math/tools/tan.sollya | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/pl/math/tools/tan.sollya b/pl/math/tools/tan.sollya new file mode 100644 index 0000000..bb0bb28 --- /dev/null +++ b/pl/math/tools/tan.sollya @@ -0,0 +1,20 @@ +// polynomial for approximating double precision tan(x) +// +// Copyright (c) 2023, Arm Limited. +// SPDX-License-Identifier: MIT OR Apache-2.0 WITH LLVM-exception + +deg = 8; + +// interval bounds +a = 0x1.0p-126; +b = pi / 8; + +display = hexadecimal; + +f = (tan(sqrt(x))-sqrt(x))/x^(3/2); +poly = fpminimax(f, deg, [|double ...|], [a*a;b*b]); + +//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 coeff(poly,i); |