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Extending Precision for Some DIRK Methods #593

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Steven-Roberts
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The Billington, Cash, and Kvaerno DIRK method coefficients only had ~10-14 digits of accuracy which can be insufficient for double and extended precision. This PR extends the coefficients to 40 digits.

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These look great. Can you add a comment to the RecentChanges and CHANGELOG files to state that the precision of these coefficients has been increased?

@balos1 balos1 added this to the SUNDIALS Next^2 milestone Oct 17, 2024
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