Adds `Wishart` and `InverseWishart` distributions - #170

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egordm wants to merge 11 commits into

statrs-dev:mainfrom

egordm:feature/wishart

Commits on Jul 5, 2022

feat: Added implementation for multivariate gamma function `mvgamma` and its log variant `mvlgamma`
egordm
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ed80711
feat: Added implementation for Wishart distribution
egordm
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933b754

Commits on Jul 7, 2022

fix: Updated inverse wishart sampling to make the matrix symmetric as pseudo inverse doesn't do this due to approximation
egordm
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fa31a22

Commits on Sep 17, 2022

fix: Fixed use use of chi^2 to chi in wishart sampling
egordm
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db1aad1
Merge branch 'master' of github.com:statrs-dev/statrs into feature/wishart
egordm
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896b3c7
fix: Fixed wishart distribution examples
egordm
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85e9898

Commits on Sep 19, 2022

fix: Updted inverse wishart to compute chol inverse instead of an approximation
egordm
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fbed089