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Hi Michael,<br>
<br>
When I run the simulation a second time, I still get the "Protected
variable name" and "Singularity in a block" (block EXPRESSION)
errors.<br>
<br>
The attached diagram does what I think you are trying to do (without
running the script).<br>
That is, when the ramp block crosses zero, save the value of the
sine block in Scilab environment and plot it.<br>
The CLKSOMV_f block is just there to give an initial impulse to
DOLLAR_f thanks to the added CLOCK_c block.<br>
<br>
As Serge stated, the variables are "transferred" to the Scilab
environment at the end of the simulation, so there is no way of
saving a variable AND loading it mid-simulation in one diagram.<br>
<br>
Hope this helps,<br>
Regards,<br>
Paul<br>
<br>
<div class="moz-cite-prefix">On 04/14/2014 05:01 PM, Michael
Ungelehrt wrote:<br>
</div>
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<div class="WordSection1">
<p class="MsoNormal"><span style="color:#1F497D">Hello Paul,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D" lang="EN-US">thank
you for your answer.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D" lang="EN-US">I
had a look at the “DOLLAR” block. It’s a kind of delay
block, but it’s not the right block for the task I have to
do, I think.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D" lang="EN-US">I
attached a simulation file, which shows the problem. This is
not the real simulation, because the real one is more
complex.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D" lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D" lang="EN-US">First
of all I load the .sce file. If I start the simulation, the
output shows the result with the initial value of C defined
in the .sce file and I get the error message “Evaluation
problem: value not updated from context. Protected variable
name. Please choose another variable name.”<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D" lang="EN-US">After
I start the simulation a second time, the output graph shows
the correct result and the error message doesn’t appear
again.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D" lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D" lang="EN-US">Is
there any possibility to write into my variable C at the
beginning of the simulation? Or is it possible to do this
task with the “DOLLAR” block like you thought?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D" lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D" lang="EN-US">Best
regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D" lang="EN-US">Michael<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D" lang="EN-US"><o:p> </o:p></span></p>
<div>
<div style="border:none;border-top:solid #B5C4DF
1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal"><b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext;mso-fareast-language:DE"
lang="EN-US">Von:</span></b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext;mso-fareast-language:DE"
lang="EN-US"> Paul Bignier
[<a class="moz-txt-link-freetext" href="mailto:paul.bignier@scilab-enterprises.com">mailto:paul.bignier@scilab-enterprises.com</a>] <br>
<b>Gesendet:</b> Donnerstag, 10. April 2014 12:35<br>
<b>An:</b> International use</span><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext;mso-fareast-language:DE">rs
mailing list for Scilab.; <a class="moz-txt-link-abbreviated" href="mailto:martin.buecherl@th-deg.de">martin.buecherl@th-deg.de</a><br>
<b>Betreff:</b> Re: [Scilab-users] Problems with "To
workspace" and "From workspace"<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-bottom:12.0pt"><br>
Hi Michael,<br>
<br>
Indeed it looks like you can't overwrite a variable defined in
the context.<br>
Have you tried replacing the "FROMWSB" block with a "DOLLAR"
block?<br>
Then it would have the same data and activation inputs as the
"TOWS_c" block,<br>
and you would not need to pre-define 'C' (just give it an
initial value in the block parameters).<br>
<br>
Hope this helps,<br>
Regards,<br>
Paul<br>
<br>
<o:p></o:p></p>
<div>
<p class="MsoNormal">On 04/10/2014 09:27 AM, Michael Ungelehrt
wrote:<o:p></o:p></p>
</div>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<p class="MsoNormal"><span lang="EN-US">Dear users,</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">I have a problem with
the “To workspace” respectively “From workspace” block in
Xcos.</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">I’d like to write the
value of a function to workspace if the value of another
function changes its sign from + to -. A short time later
I’d like to use this value in a third function and
retrieve it from workspace.</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">For that I evaluate
the first function with the “NEGTOPOS_f” block and give
the output event to the “TOWS_c” block. The “TOWS_c” block
is connected with the second function and should write the
value to a vaiable A in the workspace.</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">The “FROMWSB” block is
connected with a third function which should use the
variable that is saved before.</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">Now I have the
following problem:</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">If I start the
simulation, the “FROMWSB” says that the variable A does
not exist. So my idea was to define the variable in the
variable-browser before I start the simulation. If I do so
I get an error at the “TOWS_c” block: “Evaluation problem:
value not updated from context. Protected variable name.
Please choose another variable name.”</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">Is there any solution
for that problem?</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal"><u><span lang="EN-US">Block parameters:</span></u><o:p></o:p></p>
<p class="MsoNormal"><u><span lang="EN-US">From workspace:</span></u><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">Variable
name: C</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">Interpolation Method:
0</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">Enable zero
crossing: 1</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">Output at
end: 1</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal"><u><span lang="EN-US">To workspace:</span></u><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">Size of
buffer: 1</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">Scilab variable
name: C</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">Inherit:
0</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal"><u><span lang="EN-US">Definition of
variable C in SciNotes upfront:</span></u><o:p></o:p></p>
<p class="MsoNormal">C.time=0;<o:p></o:p></p>
<p class="MsoNormal">C.values=0; <o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Thank you in advance!<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"><span style="mso-fareast-language:DE">Mit
freundlichen Grüßen</span><o:p></o:p></p>
<p class="MsoNormal"><span style="mso-fareast-language:DE">Best
regards,</span><o:p></o:p></p>
<p class="MsoNormal"><span style="mso-fareast-language:DE"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="mso-fareast-language:DE">Michael
Ungelehrt</span><o:p></o:p></p>
<p class="MsoNormal"><span style="mso-fareast-language:DE"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="mso-fareast-language:DE"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="mso-fareast-language:DE"><img
id="Bild_x0020_1"
src="cid:part1.09060803.09070107@scilab-enterprises.com"
alt="Logo_TC_Cham" height="133" width="138"></span><o:p></o:p></p>
<p class="MsoNormal"><span style="mso-fareast-language:DE"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="mso-fareast-language:DE">Michael
Ungelehrt, B.Eng.</span><o:p></o:p></p>
<p class="MsoNormal"><span style="mso-fareast-language:DE">Laboringenieur</span><o:p></o:p></p>
<p class="MsoNormal"><span style="mso-fareast-language:DE"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="mso-fareast-language:DE">THD
– Technische Hochschule Deggendorf<br>
Technologie Campus Cham</span><o:p></o:p></p>
<p class="MsoNormal"><span style="mso-fareast-language:DE">Badstraße
21</span><o:p></o:p></p>
<p class="MsoNormal"><span style="mso-fareast-language:DE">D-93413
Cham</span><o:p></o:p></p>
<p class="MsoNormal"><span style="mso-fareast-language:DE"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="mso-fareast-language:DE">Tel:
+49 9971 99673-29</span><o:p></o:p></p>
<p class="MsoNormal"><span style="mso-fareast-language:DE">Fax:
+49 9971 99673-69</span><o:p></o:p></p>
<p class="MsoNormal"><span style="mso-fareast-language:DE">E-Mail:
<a moz-do-not-send="true"
href="mailto:michael.ungelehrt@th-deg.de">michael.ungelehrt@th-deg.de</a></span><o:p></o:p></p>
<p class="MsoNormal"><span style="mso-fareast-language:DE">Web:
<a moz-do-not-send="true"
href="http://www.tc-cham.th-deg.de/">www.tc-cham.th-deg.de</a></span><o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Times New
Roman","serif";mso-fareast-language:DE"><br>
<br>
<br>
<o:p></o:p></span></p>
<pre>_______________________________________________<o:p></o:p></pre>
<pre>users mailing list<o:p></o:p></pre>
<pre><a moz-do-not-send="true" href="mailto:users@lists.scilab.org">users@lists.scilab.org</a><o:p></o:p></pre>
<pre><a moz-do-not-send="true" href="http://lists.scilab.org/mailman/listinfo/users">http://lists.scilab.org/mailman/listinfo/users</a><o:p></o:p></pre>
</blockquote>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Times New
Roman","serif";mso-fareast-language:DE"><br>
<br>
<o:p></o:p></span></p>
<pre>-- <o:p></o:p></pre>
<pre>Paul BIGNIER<o:p></o:p></pre>
<pre>Development engineer<o:p></o:p></pre>
<pre>-----------------------------------------------------------<o:p></o:p></pre>
<pre>Scilab Enterprises<o:p></o:p></pre>
<pre>143bis rue Yves Le Coz - 78000 Versailles, France<o:p></o:p></pre>
<pre>Phone: +33.1.80.77.04.69<o:p></o:p></pre>
<pre><a moz-do-not-send="true" href="http://www.scilab-enterprises.com">http://www.scilab-enterprises.com</a> <o:p></o:p></pre>
</div>
</blockquote>
<br>
<pre class="moz-signature" cols="72">--
Paul BIGNIER
Development engineer
-----------------------------------------------------------
Scilab Enterprises
143bis rue Yves Le Coz - 78000 Versailles, France
Phone: +33.1.80.77.04.69
<a class="moz-txt-link-freetext" href="http://www.scilab-enterprises.com">http://www.scilab-enterprises.com</a> </pre>
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