feature request: elementwise matrix operations

[Seth Flaxman]

I'll open an issue unless this has already been discussed elsewhere.

For a matrix M, exp(M) works, but cos(M), sin(M), fabs(M), pow(M) etc.
do not. I'm trying to do a periodic GP using cos, so this would be
very helpful. I imagine there are other use cases, and of course the
work around is to just write a function/for loop.

Following exp's lead, I guess this should ideally be implemented for
row_vector and vector as well.

Note: at some point there might be a matrix product implemented, so
it's worth figuring out if pow(M) should be the elementwise one, i.e.
figure out what these will be named.

Best,
Seth

[Bob Carpenter]

I created a very general issue outlining what I think
we should do:

https://github.com/stan-dev/stan/issues/1464

I assigned it to myself, but it could be broken out into pieces.

Until then, I suggest writing Stan functions that do what you
want which can then be removed later when we implement them.

- Bob

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