sk: > currently i'm working on stuff that looks something like this: > > 1 read soundfile from disk in blocks of N samples (IOCArray, hsndfile > package) > 2 convert to CArray with unsafeFreeze (simple O(1) cast, carray package) > 3 perform FFT (CArray, fftw package) > 4 convert to UArr (uvector package) > 5 do some stuff with vectors > > i'd like to minimize copying, and since the FFT returns a new array > anyway, the only copying conversion is the one between CArray and > UArr in step 4. the approach i've been following is defining a > `stream' conversion for CArray, hoping that subsequent carray > accesses will be fused with uvector operations without the need for > allocating a vector in between. does that make sense? could this be a > general strategy for avoiding copying at the boundary between the > various array libraries?
If you can write a function from CArray a -> Stream a, then yep, it'll fuse, and that's a good way to avoid copying. Another way is to dive into the internals and coerce the CArray type to a MUArr. It would be helpful to see the programs people are writing with uvector, so I can polish up the API some more :) -- Don _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
