11 lines
295 B
JavaScript
11 lines
295 B
JavaScript
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function _bessel_iter(x/*:number*/, n/*:number*/, f0/*:number*/, f1/*:number*/, sign/*:number*/)/*:number*/ {
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if(n === 0) return f0;
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if(n === 1) return f1;
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var tdx = 2 / x, f2 = f1;
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for(var o = 1; o < n; ++o) {
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f2 = f1 * o * tdx + sign * f0;
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f0 = f1; f1 = f2;
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}
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return f2;
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}
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