(x, n = 15)
| 58 | } |
| 59 | } |
| 60 | ln(x, n = 15) { |
| 61 | if (x.isComplex) { |
| 62 | return x.ln() |
| 63 | } |
| 64 | let buffer = new BigNumber(0); |
| 65 | for (let i = 0; i < Math.ceil(n + (3 / 2 * x)); i++) { |
| 66 | const n = new BigNumber(1) |
| 67 | .div(new BigNumber(i).times(2).plus(1)) |
| 68 | .times( |
| 69 | new BigNumber(x).minus(1) |
| 70 | .div(new BigNumber(x).plus(1)) |
| 71 | .pow(new BigNumber(i).times(2).plus(1)) |
| 72 | ) |
| 73 | buffer = buffer.plus(n) |
| 74 | } |
| 75 | return new BigNumber(buffer.times(2).toFixed(n - 1)) |
| 76 | } |
| 77 | lngamma(z) { |
| 78 | const g_ln = 607/128; |
| 79 | const p_ln = [ |