I dream of a time when TeX notation will be acceptable and universal
in contexts like this.
y=(1/N) \sum_{i=0}^N x_i
doesn't stay ugly for very long, and is ultimately easier to read.
And you can paste it into here:
http://www.codecogs.com/latex/eqneditor.php and then it's actually
even MORE readable than anything rendered in ASCII... and it's
completely precise.
Dave.
On Mon, Dec 10, 2012 at 5:35 PM, robert bristow-johnson
<r...@audioimagination.com> wrote:
> On 12/10/12 11:18 AM, Bjorn Roche wrote:
>>
>> On Dec 10, 2012, at 4:41 AM, Alessandro Saccoia wrote:
>>
>>>> I don't think you have been clear about what you are trying to achieve.
>>>>
>>>> Are you trying to compute the sum of many signals for each time point?
>>>> Or are you trying to compute the running sum of a single signal over many
>>>> time points?
>>>
>>> Hello, thanks for helping. I want to sum prerecorded signals
>>> progressively. Each time a new recording is added to the system, this signal
>>> is added to the running mix and then discarded so the original source gets
>>> lost.
>>> At each instant it should be possible to retrieve the mix run till that
>>> moment.
>>>
>> I see. I think you'll want to go with my first suggestion:
>>
>> 1
>> Y = ---- * ( X + X + ..... X )
>> N 1 2 N
>>
>>
>> But only do the division when you "retrieve". In other words, store NY:
>>
>> NY = ( X + X + ..... X )
>> 1 2 N
>
>
>
> just a quick note, Bjorn. consider viewing your ASCII math with a
> fixed-width font. we cannot all guess at what proportional-width font you
> might have been using, but if everyone uses a fixed-width font (for ASCII
> math or ASCII art), characters line up and you can read the symbols. i use
> a combination of TeX-like constructs (like X_0, X_1, or y^2, etc) and
> positioning (like i don't like to use the LaTeX construct for a summation or
> integral for ASCII math). also i use uppercase for either transformed (freq
> domain) signals or important constants (like N). so i might express your
> first equation like:
>
> N
> y = 1/N SUM{ x_i }
> i=0
>
> or
>
> N
> y[n] = 1/N SUM{ x_i[n] }
> i=0
>
>
>
>
>
> --
>
> r b-j r...@audioimagination.com
>
> "Imagination is more important than knowledge."
>
>
>
> --
> dupswapdrop -- the music-dsp mailing list and website:
> subscription info, FAQ, source code archive, list archive, book reviews, dsp
> links
> http://music.columbia.edu/cmc/music-dsp
> http://music.columbia.edu/mailman/listinfo/music-dsp
--
dupswapdrop -- the music-dsp mailing list and website:
subscription info, FAQ, source code archive, list archive, book reviews, dsp
links
http://music.columbia.edu/cmc/music-dsp
http://music.columbia.edu/mailman/listinfo/music-dsp
