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51 lines
1.2 KiB
Markdown
51 lines
1.2 KiB
Markdown
# Function log
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Calculate the logarithm of a value.
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For matrices, the function is evaluated element wise.
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## Syntax
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```js
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math.log(x)
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math.log(x, base)
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```
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### Parameters
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Parameter | Type | Description
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--------- | ---- | -----------
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`x` | Number | BigNumber | Boolean | Complex | Array | Matrix | null | Value for which to calculate the logarithm.
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`base` | Number | BigNumber | Boolean | Complex | null | Optional base for the logarithm. If not provided, the natural logarithm of `x` is calculated. Default value: e.
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### Returns
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Type | Description
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---- | -----------
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Number | BigNumber | Complex | Array | Matrix | Returns the logarithm of `x`
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## Examples
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```js
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math.log(3.5); // returns 1.252762968495368
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math.exp(math.log(2.4)); // returns 2.4
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math.pow(10, 4); // returns 10000
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math.log(10000, 10); // returns 4
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math.log(10000) / math.log(10); // returns 4
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math.log(1024, 2); // returns 10
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math.pow(2, 10); // returns 1024
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```
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## See also
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[exp](exp.md),
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[log10](log10.md)
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