What's the deal with valarray???

So I've been spending some time in the valarray documentation and I'm wondering does anyone use this? Is it just some happy thing that got included in the STL?

It seems, for math stuff, it is a bit more useful than std::vector, but is there anything that _really_ sets it apart?

The same goes for numeric-- it seems useful, but has anyone used it?
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Those things are used to have an easy interface to some mathematical tools, eg: valarray is quite similar to a mathematical vector
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