Rasagar/Library/PackageCache/com.unity.shadergraph/Documentation~/Log-Node.md

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2024-08-26 13:07:20 -07:00
# Log Node
## Description
Returns the logarithm of input **In**. **Log** is the inverse operation to the [Exponential Node](Exponential-Node.md).
For example, the result of a base-2 **Exponential** using an input value of 3 is 8.
![](images/LogNodePage02.png)
Therefore the result of a base-2 **Log** using an input value of 8 is 3.
The logarithmic base can be switched between base-e, base-2 and base-10 from the **Base** dropdown on the node.
## Ports
| Name | Direction | Type | Description |
|:------------ |:-------------|:-----|:---|
| In | Input | Dynamic Vector | Input value |
| Out | Output | Dynamic Vector | Output value |
## Controls
| Name | Type | Options | Description |
|:------------ |:-------------|:-----|:---|
| Base | Dropdown | BaseE, Base2, Base10 | Selects the logarithmic base |
## Generated Code Example
The following example code represents one possible outcome of this node per **Base** mode.
**Base E**
```
void Unity_Log_float4(float4 In, out float4 Out)
{
Out = log(In);
}
```
**Base 2**
```
void Unity_Log2_float4(float4 In, out float4 Out)
{
Out = log2(In);
}
```
**Base 10**
```
void Unity_Log10_float4(float4 In, out float4 Out)
{
Out = log10(In);
}
```