# Development

**URL:** https://openturns.discourse.group/c/development/6.md?page=1

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## [Mauntz-Kucherenko formula](https://openturns.discourse.group/t/mauntz-kucherenko-formula/68)

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**Author:** [@josephmure](https://openturns.discourse.group/u/josephmure)\
**Replies:** 2\
**Last updated:** [December 2, 2020, 1:45pm UTC](https://openturns.discourse.group/t/mauntz-kucherenko-formula/68 "2020-12-02T13:45:33Z")

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This post follows the discussion started on Github: In the following, I use the notations defined on this page of the doc: Applying Equation (12) of the original paper the Mauntz-Kucherenko estimator of the firs…

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## [Covariance kernels for random processes with multidimensional output do not output symmetric matrices](https://openturns.discourse.group/t/covariance-kernels-for-random-processes-with-multidimensional-output-do-not-output-symmetric-matrices/55)

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**Author:** [@josephmure](https://openturns.discourse.group/u/josephmure)\
**Replies:** 1\
**Last updated:** [November 23, 2020, 7:47pm UTC](https://openturns.discourse.group/t/covariance-kernels-for-random-processes-with-multidimensional-output-do-not-output-symmetric-matrices/55 "2020-11-23T19:47:17Z")

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I think there is a mistake in the way covariance kernels for random processes with multidimensional output are handled by the library. In the following code block, I do not think operator() should return a CovarianceMat…

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## [New Viridis palette?](https://openturns.discourse.group/t/new-viridis-palette/40)

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**Author:** [@MichaelBaudin](https://openturns.discourse.group/u/MichaelBaudin)\
**Replies:** 2\
**Last updated:** [October 10, 2020, 1:32pm UTC](https://openturns.discourse.group/t/new-viridis-palette/40 "2020-10-10T13:32:45Z")

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Hi ! In the PR #1491, i created the Tableau palette, which provides new default colors for OT: These colors are taken from Matplotlib and provide colors which look better for many of us (but not all!). This does the…

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