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On 09/08/2016 09:34 PM, Pavan Yedavalli
wrote:
Hi,
This is probably a very simple question, but I have an
issue when I am using the file sink. My current flowgraph
consists of a signal source (cosine) -> stream_to_vector of
size 1024 -> forward FFT of size 1024 -> complex_to_mag
of size 1024 -> file sink of size 1024 (unbuffered OFF and
append set to overwrite).
After I run this flowgraph for a few seconds and manually
stop it, I use scipy.fromfile(open("filename"),
dtype=scipy.float32) to retrieve the values from the binary
file. However, the length of this output vector is some
integer multiple of 1024 every time. Shouldn't it always be
1024 because I'm overwriting the file? I noticed that the
longer I run the flowgraph, the larger this value is, so it
seems like it may not be overwriting? Or perhaps there is
something else I need to do make sure that my output is
always of length 1024 with just the magnitudes of each
sample? I'm sure I'm missing something very simple. Any help
would be appreciated. Thank you.
--
The "overwrite" flag doesn't mean "overwrite the output file every
time a new vector is presented". It just means that when the file
sink
opens the file, it either sets the append option in the open, or
just does the default "truncate file" option.
Standard writing-data-to-a-file semantics.
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