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<div class="moz-cite-prefix">On 01/03/2021 09:06, Stéphane Mottelet
wrote:<br>
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<blockquote type="cite"
cite="mid:93aa070c-036f-a279-0c3d-94da25e257fd@utc.fr">
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<p>Hi Frederico,</p>
<p>I do not have any problem with the variable scoping in Scilab
and as I said before, even in Julia there is a similar scoping
(at least for the particular case of functions). However, the
status of formal input and output parameters should prevent the
scoping to apply to them. For example, the following does also
work (as an addition to my previous example for the input
parameter):<br>
<br>
function y=f(x)<br>
endfunction<br>
<br>
y=1<br>
f<br>
<br>
-> f<br>
ans =<br>
<br>
1.<br>
<br>
</p>
<p>Frankly speaking, allowing such a behavior is madness...</p>
</blockquote>
<p>Hello Stéphane,</p>
<p>Yes, I think both behaviors you described are non intuitive.</p>
<p>Antoine<br>
</p>
<blockquote type="cite"
cite="mid:93aa070c-036f-a279-0c3d-94da25e257fd@utc.fr">
<p>S.<br>
</p>
<span style="color:rgb(176,24,19);"></span>
<div class="moz-cite-prefix">Le 27/02/2021 à 01:33, Federico
Miyara a écrit :<br>
</div>
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cite="mid:8ad002b5-ddc8-30b2-943f-5177d85adea7@fceia.unr.edu.ar">
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<font face="Courier New">Stéphane,<br>
<br>
I agree it shouldn't happen, but the same moment access to
outer variables is granted you can't prevent such thing to
happen since inside the function all variables have a name
which is more than just a symbol or a mute variable, and this
includes undefined arguments.<br>
<br>
This scoping feature is dangerous and I don't think it would
be advisable to create a macro for general use exploiting it.<br>
<br>
May be someone can provide an example where it has been used
with profit or explain why it was originally introduced<br>
<br>
Regards,<br>
<br>
Federico Miyara<br>
<br>
</font>
<div class="moz-cite-prefix">On 26/02/2021 10:38, Stéphane
Mottelet wrote:<br>
</div>
<blockquote type="cite"
cite="mid:f7f76f97-11be-d4e3-06f6-53548cee9d8b@utc.fr">Hi all,
<br>
<br>
In Scilab the scope of variables is quite permissive but even
in Julia (really strict rules) we can have the following
behavior: <br>
<br>
function y=f(x) <br>
y=x+a; <br>
end <br>
<br>
a=1; <br>
f(2) <br>
a=2; <br>
f(3) <br>
<br>
-> a=1; <br>
<br>
--> f(2) <br>
ans = <br>
<br>
3. <br>
<br>
--> a=2; <br>
<br>
--> f(3) <br>
ans = <br>
<br>
5. <br>
<br>
Yesterday afternoon I was my students for a Scilab beginners
tutorial, and by accident one of them had "x" defined before
in the main workspace and tried to call f without arguments. I
reproduce the experiment here by explicitely defining x before
the call: <br>
<br>
x=1; <br>
f <br>
<br>
--> x=1; <br>
<br>
--> f <br>
ans = <br>
<br>
3. <br>
<br>
Allowing the function inner scope to see variables of the
outer scope is one thing, you may or may not agree this is not
the point here, but allowing to call f without arguments just
because the formal input parameter has the same symbol as an
outer scope symbol is another thing. I knew this was possible
even if i never used such a feature, but my students were so
puzzled by this, particularly those who already learned other
low-level languages, that I decided to propose the suppression
of this, that I consider as a serious potential source of many
bugs. Don't tell me that this would break some user code
because I frankly have no consideration for this kind of
crappy shortcut and, sorry if it may sound rude, for
programmers who use it... <br>
<br>
S. <br>
<br>
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<pre class="moz-signature" cols="72">--
Stéphane Mottelet
Ingénieur de recherche
EA 4297 Transformations Intégrées de la Matière Renouvelable
Département Génie des Procédés Industriels
Sorbonne Universités - Université de Technologie de Compiègne
CS 60319, 60203 Compiègne cedex
Tel : +33(0)344234688
<a class="moz-txt-link-freetext" href="http://www.utc.fr/~mottelet" moz-do-not-send="true">http://www.utc.fr/~mottelet</a>
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