How to average a steam

GNU Radio
1

Hi,

what is the simplest way to caluclate the average of a stream?

I generate a stream of fixed length using head(). I would like to
calculate the linear average (i.e.
sum_of_all_samples/number_of_samples).

Thanks
Wolfgang

2

On Thu, May 22, 2008 at 04:43:23PM +0200, Wolfgang Buesser wrote:

Depending on your exact needs, an IIR filter will do a reasonable job
of computing a running approximation to the average value of a stream.

See gr_single_pole_iir_filter_*

http://gnuradio.org/doc/doxygen/classgr__single__pole__avg__filter__ff.html
http://gnuradio.org/doc/doxygen/classgr__single__pole__iir__filter__cc.html

Absent a better idea, start with alpha == 0.001

Eric

3

Eric B. wrote:

Thanks

Discuss-gnuradio Info Page

Hmm,

I would prefer to have the same weight for all samples. So I guess
I am looking for an FIR with N-taps 1/N each, collapsing the whole
stream
to just a single value. But I guess really setting up this filter and
picking out the
last output-value would be a rather inefficient way of performing the
task.

Wolfgang

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