10 lines
188 B
JavaScript
10 lines
188 B
JavaScript
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import hypot from './hypot';
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import log1py from './log1py';
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export default function(x) {
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var y = Math.abs(x);
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y = log1py(y * (1 + y / (hypot(1, y) + 1)));
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return x < 0 ? -y : y;
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}
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