srowen commented on issue #16556: [SPARK-19184][MLlib] Improve numerical stability for method tallSkinnyQR. URL: https://github.com/apache/spark/pull/16556#issuecomment-531965447 A 4x4 matrix isn't the use case for Spark of course and this isn't nearly as likely 'at scale', but, better accuracy is good all else equal. I haven't looked at this, but surprised if breeze doesn't already have such a solver. In any event, if it doesn't even compile, it couldn't be considered, but the principle is fine.
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