From a55b575e8089ee6cab7c5c262a7e6db55d0e34d6 Mon Sep 17 00:00:00 2001 From: Florian Merz Date: Thu, 11 Feb 2021 14:46:50 +0100 Subject: unslug es: move --- .../reference/global_objects/math/log/index.html | 112 +++++++++++++++++++++ 1 file changed, 112 insertions(+) create mode 100644 files/es/web/javascript/reference/global_objects/math/log/index.html (limited to 'files/es/web/javascript/reference/global_objects/math/log/index.html') diff --git a/files/es/web/javascript/reference/global_objects/math/log/index.html b/files/es/web/javascript/reference/global_objects/math/log/index.html new file mode 100644 index 0000000000..d243cd0501 --- /dev/null +++ b/files/es/web/javascript/reference/global_objects/math/log/index.html @@ -0,0 +1,112 @@ +--- +title: Math.log() +slug: Web/JavaScript/Referencia/Objetos_globales/Math/log +translation_of: Web/JavaScript/Reference/Global_Objects/Math/log +--- +
{{JSRef}}
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La función Math.log() devuelve la base neutral de un número (base {{jsxref ("Math.E", "e")}})

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∀x>0,Math.log(x)=ln(x)=the uniqueysuch thatey=x\forall x > 0, \mathtt{\operatorname{Math.log}(x)} = \ln(x) = \text{el unico} \; y \; \text{tal que} \; e^y = x

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La función en JavaScrcrip Math.log() es equivalente a ln(x) en matematicas.

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{{EmbedInteractiveExample("pages/js/math-log.html")}}
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Sintaxis

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Math.log(x)
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Parametetros

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+
x
+
Es un numero.
+
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Retorna el valor

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La base natural (base {{jsxref("Math.E", "e")}}) del número dado. Si el número es negativo, se devuelve {{jsxref("NaN")}} 

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Descripcion

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If the value of x is negative, the return value is always {{jsxref("NaN")}}.

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Because log() is a static method of Math, you always use it as Math.log(), rather than as a method of a Math object you created (Math is not a constructor).

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If you need the natural log of 2 or 10, use the constants {{jsxref("Math.LN2")}} or {{jsxref("Math.LN10")}} .  If you need a logarithm to base 2 or 10, use {{jsxref("Math.log2()")}} or {{jsxref("Math.log10()")}} .  If you need a logarithm to other bases, use Math.log(x) / Math.log(otherBase) as in the example below; you might want to precalculate 1 / Math.log(otherBase) .

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Examples

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Using Math.log()

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Math.log(-1); // NaN, out of range
+Math.log(0);  // -Infinity
+Math.log(1);  // 0
+Math.log(10); // 2.302585092994046
+
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Using Math.log() with a different base

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The following function returns the logarithm of y with base x (ie. logxy\log_x y):

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function getBaseLog(x, y) {
+  return Math.log(y) / Math.log(x);
+}
+
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If you run getBaseLog(10, 1000) it returns 2.9999999999999996 due to floating-point rounding, which is very close to the actual answer of 3.

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Specifications

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SpecificationStatusComment
{{SpecName('ES1')}}{{Spec2('ES1')}}Initial definition. Implemented in JavaScript 1.0.
{{SpecName('ES5.1', '#sec-15.8.2.10', 'Math.log')}}{{Spec2('ES5.1')}} 
{{SpecName('ES6', '#sec-math.log', 'Math.log')}}{{Spec2('ES6')}} 
{{SpecName('ESDraft', '#sec-math.log', 'Math.log')}}{{Spec2('ESDraft')}} 
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Browser compatibility

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{{Compat("javascript.builtins.Math.log")}}

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See also

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