# Function log2 Calculate the 2-base of a value. This is the same as calculating `log(x, 2)`. For matrices, the function is evaluated element wise. ## Syntax ```js math.log2(x) ``` ### Parameters Parameter | Type | Description --------- | ---- | ----------- `x` | number | BigNumber | Complex | Array | Matrix | Value for which to calculate the logarithm. ### Returns Type | Description ---- | ----------- number | BigNumber | Complex | Array | Matrix | Returns the 2-base logarithm of `x` ## Examples ```js math.log2(0.03125) // returns -5 math.log2(16) // returns 4 math.log2(16) / math.log2(2) // returns 4 math.pow(2, 4) // returns 16 ``` ## See also [exp](exp.md), [log](log.md), [log1p](log1p.md), [log10](log10.md)