Hello Mehdi looks to me like you forgot to run() your application:
> src_data = (0,1,1,0,1,0,1,0,1,1,10) > src = gr.vector_source_b (src_data,False) . > sink = gr.vector_sink_b() > fg.connect(src,sink) fg.run() > sink_data = sink.data() > print sink_data Regards, Andreas
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