[Discuss-gnuradio] GrBlock Inconsistent IO Size

[Jason Bonior]

I used grblock and numpy to create a block which would calculate the
variance of an incoming vector then pass on the result:

class variance(grblock.sync_block):

    def __init__(self):
        grblock.sync_block.__init__(
            self,
            name = "variance",
            in_sig = [(numpy.float32, 2048)],
            out_sig = [numpy.float32],
        )

    def work(self, input_items, output_items):
        output_items[0][:] = numpy.var(input_items[0])
        print output_items[0][:].shape
        print input_items[0].shape
        return len(output_items[0])

I added the print .shape commands to make sure that the block IO was
performing as expected. Most of the time I get (1, 2048) and (1, ) as
I would expect but occasionally I get (2, 2048) (2, ) up to (5, 2048)
(5,). Has anyone else seen anything like this or know how it might
affect the performance of the block?

-- 
Jason Bonior