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math: update documentation (#14457)

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This commit is contained in:
David 'Epper' Marshall
2022-05-20 01:45:54 -04:00
committed by GitHub
parent 23568f19da
commit 120f31b4d9
12 changed files with 108 additions and 51 deletions
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3
vlib/math/exp.v
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@ -96,6 +96,7 @@ pub fn exp2(x f64) f64 {
return expmulti(hi, lo, k)
}
// ldexp calculates frac*(2**exp)
pub fn ldexp(frac f64, exp int) f64 {
return scalbn(frac, exp)
}
@ -146,6 +147,7 @@ pub fn frexp(x f64) (f64, int) {
return f64_from_bits(y), e_
}
// expm1 calculates e**x - 1
// special cases are:
// expm1(+inf) = +inf
// expm1(-inf) = -1
@ -176,7 +178,6 @@ pub fn expm1(x f64) f64 {
}
}
// exp1 returns e**r × 2**k where r = hi - lo and |r| ≤ ln(2)/2.
fn expmulti(hi f64, lo f64, k int) f64 {
exp_p1 := 1.66666666666666657415e-01 // 0x3FC55555; 0x55555555
exp_p2 := -2.77777777770155933842e-03 // 0xBF66C16C; 0x16BEBD93