Re: [Discuss-gnuradio] Moving average and history

[Matt Ettus]

> Whoops,
> forget about skipping the history(), of course it couldn't work.
> However, by adding a state buffer to the class, the first for() loop
> can be skipped. For long MAs, this would save some multiplications and
> only increase memory usage by one item_size.

The reason we don't do that is that floating point numbers will have 
numerical errors.  If you add thousands of floats together, and then 
subtract them all out, you won't get zero.  This error will accumulate 
over time and become unstable.  That is why we start our accumulation 
over again periodically.

Matt