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title: "Bottleneck distance"
meta_title: "Bottleneck distance"
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permalink: /bottleneckdistance/
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## bottleneck_read_file_example ##

This program computes the Bottleneck distance between two persistence diagram files.

**Usage**

```
   bottleneck_read_file_example <file_1.pers> <file_2.pers> [<tolerance>]
```

where

* `<file_1.pers>` and `<file_2.pers>` must be in the format described [here](/doc/latest/fileformats.html#FileFormatsPers).
* `<tolerance>` is an error bound on the bottleneck distance (set by default to the smallest positive double value).