Oscope sink + small sample source file

Hello all

Let me try and explain my issue.

I have a file source connected to a filter and a scope sink. I see
that my scope only displays data if the source file is size x or
greater. (around 2100 samples in my case). In cases where the input
source file is smaller than x I get a blank (white) scope screen. Can
someone explain to me what is going on there? Is there a way to
display smaller files? (or do I just have an error in my methodology?)

Thanks
Jeff

#########

sps = usrp_rate / options.decim_rate

#Setup scopes
self.scope1 = scopesink.scope_sink_f(self, panel, sample_rate=sps)

self._build_gui(vbox)

#Data source files
signal_src = gr.file_source(gr.sizeof_gr_complex, options.signal_file)

#Filter Signal Data
xtaps_signal = gr.firdes.low_pass(1.0, sps, filter_cutoff,
filter_transition_width,gr.firdes.WIN_HAMMING)

xfilter_signal = gr.freq_xlating_fir_filter_ccf(1, xtaps_signal, offset,
sps)
self.connect(signal_src,xfilter_signal)

c2r1 = gr.complex_to_real()

self.connect(xfilter_signal, c2r1, (self.scope1,0))

The scope does not display every sample. It only redraws at about 20 or
25 Hz as I remember, and is really only intended for continuous streams
of data.

Matt

I guess I have MATLAB on this machine for a reason… Maybe I should use
it.

Thanks

…or matplotlib, see http://matplotlib.sourceforge.net/