mirror of
https://github.com/ETLCPP/etl.git
synced 2026-06-16 00:46:03 +08:00
76 lines
1.3 KiB
Markdown
76 lines
1.3 KiB
Markdown
---
|
|
title: "Gamma"
|
|
---
|
|
|
|
{{< callout type="info">}}
|
|
Header: `gamma.h`
|
|
From: `20.9.0`
|
|
{{< /callout >}}
|
|
|
|
There are two gamma functors, `gamma_encode` and `gamma_decode`.
|
|
|
|
```cpp
|
|
template <typename TInput>
|
|
class gamma_encode : public etl::unary_function<TInput, TInput>
|
|
```
|
|
```cpp
|
|
template <typename TInput>
|
|
class gamma_decode : public etl::unary_function<TInput, TInput>
|
|
```
|
|
|
|
`TInput` The input data type.
|
|
|
|
```cpp
|
|
gamma_encode(double gamma, TInput maximum)
|
|
```
|
|
**Description**
|
|
Constructor.
|
|
|
|
---
|
|
|
|
```cpp
|
|
TInput operator()(TInput value) const
|
|
```
|
|
**Description**
|
|
Gamma a value.
|
|
|
|
---
|
|
|
|
```cpp
|
|
gamma_decode(double gamma, TInput maximum)
|
|
```
|
|
**Decsription**
|
|
Constructor.
|
|
|
|
---
|
|
|
|
```cpp
|
|
TInput operator()(TInput value) const
|
|
```
|
|
**Description**
|
|
Gamma a value.
|
|
|
|
## Example
|
|
```cpp
|
|
std::array<double, 10> input
|
|
{
|
|
0.0, 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0
|
|
};
|
|
|
|
std::array<double, 10> output_encode;
|
|
|
|
etl::gamma_encode<double> gamma_encode(0.5, 9.0);
|
|
|
|
std::transform(input.begin(), input.end(), output_encode.begin(), gamma_encode);
|
|
|
|
// output_encode == 0.0, 0.11, 0.44, 1.00, 1.78, 2.78, 4.00, 5.44, 7.11, 9.00
|
|
|
|
std::array<double, 10> output_decode;
|
|
|
|
etl::gamma_decode<double> gamma_decode(0.5, 9.0);
|
|
|
|
std::transform(output_encode.begin(), output_encode.end(), output_decode.begin(), gamma_decode);
|
|
|
|
// output_decode == 0.0, 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0
|
|
```
|