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54 lines
1014 B
Markdown
54 lines
1014 B
Markdown
---
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title: "rescale"
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---
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{{< callout type="info">}}
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Header: `rescale.h`
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Since: `20.9.0`
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{{< /callout >}}
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Rescales an input range.
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```cpp
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template <typename TInput, typename TOutput>
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class rescale : public etl::unary_function<TOutput, 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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rescale (TInput input_min_value,
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TInput input_max_value,
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TOutput output_min_value,
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TOutput output_max_value)
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```
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**Description**
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Sets the rescale limits.
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---
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```cpp
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TOutput operator()(TInput value) const
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```
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**Description**
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Rescale a value.
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## Example
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```cpp
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std::array<char, 10> input =
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{
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10, 11, 12, 13, 14, 15, 16, 17, 18, 19
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};
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std::array<int, 10> output;
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etl::rescale<char, int> rescale(10, 19, 40000, 41900);
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std::transform(input.begin(), input.end(), output.begin(), rescale);
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// output = 40000, 40211, 40422, 40633, 40844, 41055, 41266, 41477, 41688, 41900
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```
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