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71 lines
1.5 KiB
Markdown
71 lines
1.5 KiB
Markdown
---
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title: "quantize"
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---
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{{< callout type="info">}}
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Header: `quantize.h`
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From: `20.9.0`
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{{< /callout >}}
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Quantizes an input range.
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```cpp
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template <typename TInput, typename TCompare = etl::less<TInput> >
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class quantize : public etl::unary_function<TInput, TInput>
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```
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`TInput` The input data type.
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`TCompare` The functor type used to compare values to the threshold. The default is `etl::less`.
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---
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```cpp
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quantize(const TInput* p_thresholds,
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const TInput* p_quantizations,
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size_t n_quantizations,
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TCompare compare = TCompare())
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```
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**Description**
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`p_thresholds` A pointer to the list of threshold values.
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`p_quantizations` A pointer to the list of quantization values. One more than the number of thresholds.
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`n_quantizations` The number of quantization values.
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---
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```cpp
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TInput operator()(TInput value) const
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```
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**Description**
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Quantatize a value.
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---
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## Example
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```cpp
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constexpr size_t Size = 20U;
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constexpr size_t NThresholds = 4U;
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std::array<int, NThresholds> thresholds =
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{
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14, 18, 22, 25
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};
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std::array<int, NThresholds + 1> quantizations =
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{
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1, 2, 3, 4, 5
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};
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std::array<int, Size> input =
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{
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10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29
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};
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std::array<int, Size> output;
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etl::quantize<int> quantize(thresholds.data(), quantizations.data(), quantizations.size());
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std::transform(input.begin(), input.end(), output.begin(), quantize);
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// output = 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 4, 4, 4, 5, 5, 5, 5, 5
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```
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