sampling of cost matrices

[codecov[bot]]

Codecov Report

Patch coverage: 88.88% and project coverage change: +0.02 :tada:

Comparison is base (dfb74c8) 86.79% compared to head (e14627c) 86.81%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #128 +/- ## ========================================== + Coverage 86.79% 86.81% +0.02% ========================================== Files 12 12 Lines 2241 2252 +11 ========================================== + Hits 1945 1955 +10 - Misses 296 297 +1 ``` | Flag | Coverage Δ | | |---|---|---| | unittests | `86.81% <88.88%> (+0.02%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Fredrik+Bagge+Carlson#carryforward-flags-in-the-pull-request-comment) to find out more. | [Impacted Files](https://app.codecov.io/gh/baggepinnen/ControlSystemIdentification.jl/pull/128?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Fredrik+Bagge+Carlson) | Coverage Δ | | |---|---|---| | [src/ControlSystemIdentification.jl](https://app.codecov.io/gh/baggepinnen/ControlSystemIdentification.jl/pull/128?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Fredrik+Bagge+Carlson#diff-c3JjL0NvbnRyb2xTeXN0ZW1JZGVudGlmaWNhdGlvbi5qbA==) | `82.24% <88.88%> (+0.60%)` | :arrow_up: |

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