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Update Approx documentation

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Martin Hořeňovský 2017-11-01 13:45:21 +01:00
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docs/assertions.md
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@ -64,7 +64,7 @@ This way `Approx` is constructed with reasonable defaults, covering most simple
* __epsilon__ - epsilon serves to set the percentage by which a result can be erroneous, before it is rejected. By default set to `std::numeric_limits<float>::epsilon()*100`.
* __margin__ - margin serves to set the the absolute value by which a result can be erroneous before it is rejected. By default set to `0.0`.
* __scale__ - scale serves to adjust the base for comparison used by epsilon, can be used when By default set to `1.0`.
* __scale__ - scale serves to adjust the epsilon's multiplicator. By default set to `0.0`.
#### epsilon example
```cpp
@ -84,7 +84,12 @@ Approx target = Approx(100).margin(5);
```
#### scale
Scale can be useful if the computation leading to the result worked on different scale, than is used by the results (and thus expected errors are on a different scale than would be expected based on the results alone).
Scale can be useful if the computation leading to the result worked
on different scale than is used by the results. Since allowed difference
between Approx's value and compared value is based primarily on Approx's value
(the allowed difference is computed as
`(Approx::scale + Approx::value) * epsilon`), the resulting comparison could
need rescaling to be correct.
## Exceptions