I had looked at those blocks, but can't figure out a way to get them to do what I want... (2,3,1) into gr.packed_to_unpacked_ss(1,gr.GR_MSB_FIRST) gives: (0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1) rather than: (1,0,1,1,0,1)
*bang head on keyboard in search of enlightenment* On Jan 10, 2008 4:51 PM, Eric Blossom <[EMAIL PROTECTED]> wrote: > On Thu, Jan 10, 2008 at 04:43:17PM -0500, Steven Clark wrote: > > Hey folks- > > > > Let's say I have a stream of shorts whose values are one of [0,1,2,3] > (in > > other words, the bottom 2 bits are active). I want to split these bits, > so > > that: > > [2,3,3,1,0] -> [1,0,1,1,1,1,0,1,0,0], etc. > > > > What block(s) can help me achieve this? > > > gr_packed_to_unpacked or gr_chunks_to_symbols are probably close to > what you're looking for. > > Eric > > > /*! > * \brief Convert a stream of packed bytes or shorts to stream of unpacked > bytes or shorts. > * \ingroup block > * > * input: stream of @I_TYPE@; output: stream of @O_TYPE@ > * > * This is the inverse of gr_unpacked_to_packed_XX. > * > * The bits in the bytes or shorts input stream are grouped into chunks of > * \p bits_per_chunk bits and each resulting chunk is written right- > * justified to the output stream of bytes or shorts. > * All b or 16 bits of the each input bytes or short are processed. > * The right thing is done if bits_per_chunk is not a power of two. > * > * The combination of gr_packed_to_unpacked_XX_ followed by > * gr_chunks_to_symbols_Xf or gr_chunks_to_symbols_Xc handles the > * general case of mapping from a stream of bytes or shorts into > * arbitrary float or complex symbols. > * > * \sa gr_packed_to_unpacked_bb, gr_unpacked_to_packed_bb, > * \sa gr_packed_to_unpacked_ss, gr_unpacked_to_packed_ss, > * \sa gr_chunks_to_symbols_bf, gr_chunks_to_symbols_bc. > * \sa gr_chunks_to_symbols_sf, gr_chunks_to_symbols_sc. > */ >
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