1 | ;
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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.createLog = void 0;
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7 |
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8 | var _factory = require("../../utils/factory");
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9 |
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10 | var _collection = require("../../utils/collection");
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11 |
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12 | var _number = require("../../plain/number");
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13 |
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14 | var name = 'log';
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15 | var dependencies = ['config', 'typed', 'divideScalar', 'Complex'];
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16 | var createLog = /* #__PURE__ */(0, _factory.factory)(name, dependencies, function (_ref) {
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17 | var typed = _ref.typed,
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18 | config = _ref.config,
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19 | divideScalar = _ref.divideScalar,
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20 | Complex = _ref.Complex;
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21 |
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22 | /**
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23 | * Calculate the logarithm of a value.
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24 | *
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25 | * For matrices, the function is evaluated element wise.
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26 | *
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27 | * Syntax:
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28 | *
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29 | * math.log(x)
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30 | * math.log(x, base)
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31 | *
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32 | * Examples:
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33 | *
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34 | * math.log(3.5) // returns 1.252762968495368
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35 | * math.exp(math.log(2.4)) // returns 2.4
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36 | *
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37 | * math.pow(10, 4) // returns 10000
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38 | * math.log(10000, 10) // returns 4
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39 | * math.log(10000) / math.log(10) // returns 4
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40 | *
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41 | * math.log(1024, 2) // returns 10
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42 | * math.pow(2, 10) // returns 1024
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43 | *
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44 | * See also:
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45 | *
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46 | * exp, log2, log10, log1p
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47 | *
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48 | * @param {number | BigNumber | Complex | Array | Matrix} x
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49 | * Value for which to calculate the logarithm.
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50 | * @param {number | BigNumber | Complex} [base=e]
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51 | * Optional base for the logarithm. If not provided, the natural
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52 | * logarithm of `x` is calculated.
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53 | * @return {number | BigNumber | Complex | Array | Matrix}
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54 | * Returns the logarithm of `x`
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55 | */
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56 | var log = typed(name, {
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57 | number: function number(x) {
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58 | if (x >= 0 || config.predictable) {
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59 | return (0, _number.logNumber)(x);
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60 | } else {
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61 | // negative value -> complex value computation
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62 | return new Complex(x, 0).log();
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63 | }
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64 | },
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65 | Complex: function Complex(x) {
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66 | return x.log();
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67 | },
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68 | BigNumber: function BigNumber(x) {
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69 | if (!x.isNegative() || config.predictable) {
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70 | return x.ln();
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71 | } else {
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72 | // downgrade to number, return Complex valued result
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73 | return new Complex(x.toNumber(), 0).log();
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74 | }
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75 | },
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76 | 'Array | Matrix': function ArrayMatrix(x) {
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77 | return (0, _collection.deepMap)(x, log);
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78 | },
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79 | 'any, any': function anyAny(x, base) {
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80 | // calculate logarithm for a specified base, log(x, base)
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81 | return divideScalar(log(x), log(base));
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82 | }
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83 | });
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84 | return log;
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85 | });
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86 | exports.createLog = createLog; |
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