1 | "use strict";
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2 |
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3 | Object.defineProperty(exports, "__esModule", {
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4 | value: true
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5 | });
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6 | exports.createStirlingS2 = void 0;
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7 |
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8 | var _factory = require("../../utils/factory.js");
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9 |
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10 | var name = 'stirlingS2';
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11 | var dependencies = ['typed', 'addScalar', 'subtract', 'multiplyScalar', 'divideScalar', 'pow', 'factorial', 'combinations', 'isNegative', 'isInteger', 'larger'];
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12 | var createStirlingS2 = (0, _factory.factory)(name, dependencies, function (_ref) {
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13 | var typed = _ref.typed,
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14 | addScalar = _ref.addScalar,
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15 | subtract = _ref.subtract,
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16 | multiplyScalar = _ref.multiplyScalar,
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17 | divideScalar = _ref.divideScalar,
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18 | pow = _ref.pow,
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19 | factorial = _ref.factorial,
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20 | combinations = _ref.combinations,
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21 | isNegative = _ref.isNegative,
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22 | isInteger = _ref.isInteger,
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23 | larger = _ref.larger;
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24 |
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49 | return typed(name, {
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50 | 'number | BigNumber, number | BigNumber': function numberBigNumberNumberBigNumber(n, k) {
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51 | if (!isInteger(n) || isNegative(n) || !isInteger(k) || isNegative(k)) {
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52 | throw new TypeError('Non-negative integer value expected in function stirlingS2');
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53 | } else if (larger(k, n)) {
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54 | throw new TypeError('k must be less than or equal to n in function stirlingS2');
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55 | }
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56 |
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57 |
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58 | var kFactorial = factorial(k);
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59 | var result = 0;
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60 |
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61 | for (var i = 0; i <= k; i++) {
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62 | var negativeOne = pow(-1, subtract(k, i));
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63 | var kChooseI = combinations(k, i);
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64 | var iPower = pow(i, n);
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65 | result = addScalar(result, multiplyScalar(multiplyScalar(kChooseI, iPower), negativeOne));
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66 | }
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67 |
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68 | return divideScalar(result, kFactorial);
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69 | }
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70 | });
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71 | });
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72 | exports.createStirlingS2 = createStirlingS2; |
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