21 lines
564 B
Plaintext
21 lines
564 B
Plaintext
// polynomial for approximating atanf(x)
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//
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// Copyright (c) 2022-2023, Arm Limited.
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// SPDX-License-Identifier: MIT OR Apache-2.0 WITH LLVM-exception
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// Generate list of monomials:
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// Taylor series of atan is of the form x + ax^3 + bx^5 + cx^7 + ...
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// So generate a, b, c, ... such that we can approximate atan(x) by:
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// x + x^3 * (a + bx^2 + cx^4 + ...)
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deg = 7;
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a = 1.1754943508222875e-38;
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b = 1;
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poly = fpminimax((atan(sqrt(x))-sqrt(x))/x^(3/2), deg, [|single ...|], [a;b]);
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display = hexadecimal;
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print("coeffs:");
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for i from 0 to deg do coeff(poly,i);
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