Raul wrote:
>This isn't really worth a pull request, but double->float is 1&(3!:5)
>and float->double is _1&(3!:5)
>This is documented at
>http://www.jsoftware.com/help/dictionary/dx003.htm
<http://www.jsoftware.com/help/dictionary/dx003.htm>. (Note that floats
>are represented as a sequence of literals, because J can't work with
>them.)
Thanks Raul: I've used 3!:5/fc at some point in my brief J career to
accomplish this (I think in the flann hooks).
For my education: when I do a=. 1&(3!:5)b, this does a deep copy,
right? Aka, there isn't some weird bit masking thing, with a and b
referring to the same memory location, is there? I confess, I never
quite understood what the C compiler does when you do something like a
= (float *) &b; -I always figured it was passing to a by reference somehow.
Speaking of deep copy, the only tricky part of this is going to be
pushing the data to the GPU and pulling it back out again. If I can
return some kind of useful pointers to the GPU data, the way it is done
in Torch7, it should work pretty well.
I'm quite pleased with the blas-mp speedup; it's already useful.
-SL
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