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49 lines
1.2 KiB
Markdown
49 lines
1.2 KiB
Markdown
<!-- Note: This file is automatically generated from source code comments. Changes made in this file will be overridden. -->
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# Function log1p
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Calculate the logarithm of a `value+1`.
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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.log1p(x)
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math.log1p(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 | Complex | Array | Matrix | Value for which to calculate the logarithm of `x+1`.
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`base` | number | BigNumber | Complex | Optional base for the logarithm. If not provided, the natural logarithm of `x+1` 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+1`
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## Examples
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```js
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math.log1p(2.5); // returns 1.252762968495368
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math.exp(math.log1p(1.4)); // returns 2.4
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math.pow(10, 4); // returns 10000
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math.log1p(9999, 10); // returns 4
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math.log1p(9999) / math.log(10); // returns 4
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```
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## See also
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[exp](exp.md),
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[log](log.md),
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[log2](log2.md),
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[log10](log10.md)
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