Breeze vs. Spire: Can/should I combine them?
<p>I use breeze's collections (namely <code>DenseVector</code>), in which I have integers and doubles and the like, and use them a little like you might use numpy's arrays. I stumbled upon <a href="https://github.com/non/spire" rel="noreferrer">https://github.com/non/spire</a>. My impression is, it is not so strong on collection, but stronger on types that I might want to put inside of collections - e.g. <code>Interval</code> sounds awesome. Is my impression right and would be combining them a good idea?</p>

<p>From <a href="https://stackoverflow.com/a/40474914/4533188">https://stackoverflow.com/a/40474914/4533188</a> I learned that Breeze uses <a href="https://github.com/fommil/netlib-java/" rel="noreferrer">netlib-java</a> to be really fast. Would I destroy that speed if I put descendants of <code>AnyRef</code> (in this case from Spire) into the <code>DenseVector</code>s back-end Arrays instead of descendants of <code>AnyVal</code>?</p>