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<font face="Courier New">Claus,</font><br>
<br>
<blockquote type="cite"
cite="mid:03232727-dcad-2adf-61ae-baf93423699c@gmail.com">For me
the plurality is not so important - but let's say it's the wording
used in all our educational books (in English) ... just dig into
any Signal Analysis book, etc., and what we're trying to name here
is exactly that, then it would be bad for Scilab to give it a
different name. Renaming something that is universally defined
otherwise is an uphill battle we cannot win.<br>
</blockquote>
<br>
As I implied earlier, nomenclature could hardly be right or wrong
since it is mostly arbitrary. But there could be more logical or
less logical choices.<br>
<br>
When it is well established, it is also a battle that is not worth
fighting, especially if there is some sort of rationale behind it.<br>
<br>
<blockquote type="cite"
cite="mid:03232727-dcad-2adf-61ae-baf93423699c@gmail.com">
<div class="moz-cite-prefix">Asymmetric window functions is new to
me.I googled about window functions and found (stumbled upon):<br>
</div>
<div class="moz-cite-prefix"><a class="moz-txt-link-freetext"
href="https://journals.sagepub.com/doi/pdf/10.1260/1748-3018.9.4.389"
moz-do-not-send="true">https://journals.sagepub.com/doi/pdf/10.1260/1748-3018.9.4.389</a></div>
</blockquote>
<br>
This is another kind of asymmetry. "Periodic" window functions are
only slightly asymmetric. I don't think they qualify for the kind of
windows treated in that paper.<br>
<br>
Asymmetric windows seem to be a good choice to smooth out the
spectrum if phase response is not important. Scilab doesn't have any
asymmetric function, but if a plan to add new windows were approved,
they could be included along with several more traditional window
functions currently not covered (such as Blackman, Blackman-Harris
or a number of flat-tops).<br>
<br>
Symmetric windows are used for FIR filter design. Periodic windows
are used for spectrum analysis.<br>
<br>
Regards,<br>
<br>
Federico Miyara<br>
<br>
<blockquote type="cite"
cite="mid:03232727-dcad-2adf-61ae-baf93423699c@gmail.com">
<div class="moz-cite-prefix">Conclusion: Asymmetric window
functions have a purpose. When there's asymmetric windows, then
there must also be symmetric windows.<br>
</div>
<div class="moz-cite-prefix">Here's a short list of symmetric
window functions: <a class="moz-txt-link-freetext"
href="https://mathworld.wolfram.com/ApodizationFunction.html"
moz-do-not-send="true">https://mathworld.wolfram.com/ApodizationFunction.html</a><br>
</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">Best regards,</div>
<div class="moz-cite-prefix">Claus<br>
</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">On 12-04-2021 17:19, Federico Miyara
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:f797e2c6-c662-fe44-65d8-babf22097f30@fceia.unr.edu.ar">
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<font face="Courier New">Samuel:<br>
<br>
</font><font face="Courier New">As a general concept, y</font><font
face="Courier New">ou are right ... but with nuances. The
problem is deciding when something is really wrong and when it
is just a question of opinion or personal preference. It is
wrong to say the Earth is flat, no matter how many people say
it. But is it right or wrong to call something just a
conventional name? <br>
<br>
For instance: Is it right to call </font><font face="Courier
New">the derivative of a function </font><font face="Courier
New">"derivative"? Probably not, because "derivative" is a
general concept which seems to have no relationship with its
meaning in math. Probably in its origins it was more related
to grammar than to math. But once established for centuries,
it wouldn't be convenient to change it on the basis that it is
"wrong".<br>
<br>
By the same token, calling "periodic" a window function
obtained from periodic functions (cosines) whose period is
equal to its length doesn't seem intrinsically wrong to me.
Calling it "closed" would be worse since one immediately
thinks either of a closed set, which is not, or a closed
curve, which isn't either.<br>
<br>
But even if we found a better word, changing it would very
likely create an unnecessary cognitive dissonance to thousands
or millions of practitioners.<br>
<br>
Anyway, if a much better and cristal-clear word (i.e., whose
meaning would be immediately obvious in its context) were
found and gained consensus, no problem to use it instead of
"periodic". The important thing in my proposal was to include
in the window() function the feature, not how we call it.<br>
<br>
Regards,<br>
<br>
Federico Miyara <br>
<br>
<br>
</font><br>
<div class="moz-cite-prefix">On 12/04/2021 04:22, Dang Ngoc
Chan, Christophe wrote:<br>
</div>
<blockquote type="cite"
cite="mid:DB8PR07MB63155030B1368401B3C96947E5709@DB8PR07MB6315.eurprd07.prod.outlook.com">
<pre class="moz-quote-pre" wrap="">Hello,
</pre>
<blockquote type="cite">
<pre class="moz-quote-pre" wrap="">De : Federico Miyara
Envoyé : dimanche 11 avril 2021 02:08
Like it or not, I guess these keywords come from Matlab, and as Matlab
still seems to dominate the market, many people, including those
willing to quit Matlab (as I did several years ago), are quite used to
those keywords
</pre>
</blockquote>
<pre class="moz-quote-pre" wrap="">I don't agree with this argument.
If a way of doing is wrong, then just keep on going because "everybody does so" is just an argumentum ad populum
<a class="moz-txt-link-freetext" href="https://en.wikipedia.org/wiki/Argumentum_ad_populum" moz-do-not-send="true">https://en.wikipedia.org/wiki/Argumentum_ad_populum</a>
which is a fallacious argument.
Regards.
--
Christophe Dang Ngoc Chan
Mechanical calculation engineer
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