Re: [Discuss-gnuradio] max_streams problem in own module

[T. Charles Clancy]

> clancy> Cool, that seems to work.  Is there a derivative block?  Something
> clancy> that takes float f(x) and returns float f'(x)?
>
> A filter with taps [1, 0, -1] works "satisfactorily" as a differentiator. Try
> this small program.

::Dusting off numerical analysis textbook...::

Indeed, that should work, though you might want to scale it by 1/2 
depending on your application.  In fact, considering the numeric nature of 
the calculation, unless you want to interpolate the polynomial and 
symbolically differentiate, there's not much else you can do.  Using taps 
[1 -1] might give you more resolution, but would probably yield more 
jitter.

[ t. charles clancy ]--[ address@hidden ]--[ www.cs.umd.edu/~clancy ]
[ computer science ]-----[ university of maryland | college park ]