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<font face="Courier New">Stéphane,<br>
<br>
Sometimes one just needs to extract some parameter from an entity
and indexing is a valid way to access it.<br>
<br>
Federico<br>
<br>
</font><br>
<div class="moz-cite-prefix">On 08/04/2019 12:18, Stéphane Mottelet
wrote:<br>
</div>
<blockquote cite="mid:1471815f-4762-a3e0-da80-98ccffffc90c@utc.fr"
type="cite">
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<p>Hello,<br>
</p>
<div class="moz-cite-prefix">Le 07/04/2019 à 10:13, Federico
Miyara a écrit :<br>
</div>
<blockquote type="cite"
cite="mid:042206a1-dc83-5c3f-45cf-679987ebf8c8@fceia.unr.edu.ar">
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<font face="Courier New">Dear all,<br>
<br>
I would like to know if there is a reason for the fact that
whenever new graphic objects are added to an axes, the last
one that has been created is always the one with index 1
instead of n+1 (where n is the number of objects prior to new
one).<br>
<br>
Example:</font><span style="color:rgb(0,0,0);"><br>
<br>
</span><span style="color:rgb(0,0,0);">scf</span><span
style="color:rgb(74,85,219);">(</span><span
style="color:rgb(188,143,143);">1</span><span
style="color:rgb(74,85,219);">)</span> <br>
<span style="color:rgb(0,0,0);">clf</span><span
style="color:rgb(74,85,219);">(</span><span
style="color:rgb(188,143,143);">1</span><span
style="color:rgb(74,85,219);">)</span> <span
style="color:rgb(50,185,185);"><br>
<br>
</span><span style="color:rgb(75,149,50);font-style:italic;">//
Plot a simple two-point graph <br>
</span><span style="color:rgb(50,185,185);">plot2d</span><span
style="color:rgb(74,85,219);">(</span><span
style="color:rgb(74,85,219);">[</span><span
style="color:rgb(188,143,143);">0</span><span
style="color:rgb(0,0,0);">,</span> <span
style="color:rgb(188,143,143);">1</span><span
style="color:rgb(74,85,219);">]</span><span
style="color:rgb(0,0,0);">,</span> <span
style="color:rgb(74,85,219);">[</span><span
style="color:rgb(188,143,143);">0</span><span
style="color:rgb(0,0,0);">,</span> <span
style="color:rgb(188,143,143);">1</span><span
style="color:rgb(74,85,219);">]</span><span
style="color:rgb(74,85,219);">)</span> <br>
<span style="color:rgb(0,0,0);">ax</span> <span
style="color:rgb(92,92,92);">=</span> <span
style="color:rgb(0,0,0);">gca</span><span
style="color:rgb(74,85,219);">(</span><span
style="color:rgb(74,85,219);">)</span><br>
<span style="color:rgb(74,85,219);"></span><br>
<span style="color:rgb(75,149,50);font-style:italic;">// Colect
plotted data </span><br>
<span style="color:rgb(0,0,0);">a</span> <span
style="color:rgb(92,92,92);">=</span> <span
style="color:rgb(0,0,0);">ax</span><span
style="color:rgb(92,92,92);">.</span><span
style="color:rgb(170,170,170);">children</span><span
style="color:rgb(74,85,219);">(</span><span
style="color:rgb(188,143,143);">1</span><span
style="color:rgb(74,85,219);">)</span><span
style="color:rgb(92,92,92);">.</span><span
style="color:rgb(170,170,170);">children</span><span
style="color:rgb(92,92,92);">.</span><span
style="color:rgb(170,170,170);">data<br>
</span> <span style="color:rgb(50,185,185);"></span><br>
<span style="color:rgb(50,185,185);"></span><span
style="color:rgb(75,149,50);font-style:italic;">// Plot a
simple two-point graph <br>
</span><span style="color:rgb(50,185,185);">plot2d</span><span
style="color:rgb(74,85,219);">(</span><span
style="color:rgb(74,85,219);">[</span><span
style="color:rgb(188,143,143);">0</span><span
style="color:rgb(0,0,0);">,</span> <span
style="color:rgb(188,143,143);">1</span><span
style="color:rgb(74,85,219);">]</span><span
style="color:rgb(0,0,0);">,</span><span
style="color:rgb(74,85,219);">[</span><span
style="color:rgb(188,143,143);">0.5</span><span
style="color:rgb(0,0,0);">,</span> <span
style="color:rgb(188,143,143);">1.5</span><span
style="color:rgb(74,85,219);">]</span><span
style="color:rgb(74,85,219);">)<br>
</span> <br>
<span style="color:rgb(0,0,0);"><span
style="color:rgb(75,149,50);font-style:italic;">// Colect
plotted data corresponding to index 1</span><br>
<span style="color:rgb(0,0,0);"></span>b</span> <span
style="color:rgb(92,92,92);">=</span> <span
style="color:rgb(0,0,0);">ax</span><span
style="color:rgb(92,92,92);">.</span><span
style="color:rgb(170,170,170);">children</span><span
style="color:rgb(74,85,219);">(</span><span
style="color:rgb(188,143,143);">1</span><span
style="color:rgb(74,85,219);">)</span><span
style="color:rgb(92,92,92);">.</span><span
style="color:rgb(170,170,170);">children</span><span
style="color:rgb(92,92,92);">.</span><span
style="color:rgb(170,170,170);">data</span> <span
style="color:rgb(0,0,0);"><br>
<br>
</span><span style="color:rgb(0,0,0);"><span
style="color:rgb(0,0,0);"><span
style="color:rgb(75,149,50);font-style:italic;">// Colect
plotted data corresponding to index 2</span><br>
<span style="color:rgb(0,0,0);"></span></span>c</span> <span
style="color:rgb(92,92,92);">=</span> <span
style="color:rgb(0,0,0);">ax</span><span
style="color:rgb(92,92,92);">.</span><span
style="color:rgb(170,170,170);">children</span><span
style="color:rgb(74,85,219);">(</span><span
style="color:rgb(188,143,143);">2</span><span
style="color:rgb(74,85,219);">)</span><span
style="color:rgb(92,92,92);">.</span><span
style="color:rgb(170,170,170);">children</span><span
style="color:rgb(92,92,92);">.</span><span
style="color:rgb(170,170,170);">data<br>
<br>
</span><font face="Courier New">After the first plot we get <br>
<br>
a = <br>
0. 0.<br>
1. 1.<br>
<br>
After the second plot we get<br>
<br>
b = <br>
0. 0.5<br>
1. 1.5<br>
<br>
c = <br>
<br>
0. 0.<br>
1. 1.<br>
</font><span style="color:rgb(0,0,0);"> </span><br>
I would expect that b = a, i.e, once a children object has been
created on the axes, it would be reasonable that its index were
kept constant. The current behavior is as if each new object
were inserted in the structure before the previous one instead
of after it. <br>
</blockquote>
<p>I would say that the set of children is a stack, i.e. each new
child is "pushed" on top. Anyway, relying on child order seems,
to me, a bad idea. For example, legend takes as (optional) first
argument an array of handles, and not an array of child numbers.</p>
<p>S.<br>
</p>
<blockquote type="cite"
cite="mid:042206a1-dc83-5c3f-45cf-679987ebf8c8@fceia.unr.edu.ar">
<br>
Regards,<br>
<br>
Federico Miyara<br>
<br>
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