Re: [Boost-users] [fusion][mpl::math] generic math operations

From: Chris Weed (chrisweed_at_[hidden])
Date: 2007-01-22 21:37:57

The first thing I want to try is as follows:

I would like to be able to use this algorithm on compile-time values,
such as a known filter, and re-use it on the input signal I want to
process at run-time.

The usual use case is that you have a pre-computed filter (the DFT of
your filter), and perform an FFT on an input signal at run-time.
Instead of calculating the DFT off-line, I would like to just
calculate this with a compile-time operation. For now, I could just
use the DFT operation for the run-time calculation, but maybe later
rewrite it as an FFT.

After this I would like to try this on signals that mix run-time and
compile-time values, such as a signal padded with zeros. This could
potentially eliminate the usual DFT/FFT instructions on the zeroed
part, using the compiler to optimize these away.
Chris

On 1/22/07, Joel de Guzman <joel_at_[hidden]> wrote:
> Chris Weed wrote:
> > Hi,
> > I wanted to try to write a DFT that can take a compile-time data
> > structure such as the following:
> >
> [snip]
>
> There doesn't seem to be a runtime component there. What am I missing?
> Do you intend to mix runtime values (e.g. int, doubles) with mpl
> math stuff?
>
> Regards,
> --
> Joel de Guzman
> http://www.boost-consulting.com
> http://spirit.sf.net
>
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