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Hello Romain,<br>
<br>
The difference is due to the solver type. Your diagram currently
selects the ODE solver Sundials/CVode - BDF - Newton.<br>
<br>
"xcos_simulate(scs_m, 4);" detects two continuous states and
switches to a DAE solver (Sundials/IDA).<br>
<br>
"scicos_simulate(scs_m);" only detects one continuous state and
keeps the ODE solver.<br>
<br>
This must be due to a Modelica compilation difference between xcos
and scicos.<br>
<br>
I don't know the equations of your model so I cannot assess which
method is correct.<br>
<br>
Also, I noticed that the context variables (C, R, T, end_time) are
not present in the diagram, so what are you trying to change when
you modify the context? You might want ot use the <a
href="http://help.scilab.org/docs/5.4.1/fr_FR/ENDBLK.html">END</a>
block to set the end time.<br>
<br>
Hope this helps,<br>
Regards,<br>
Paul<br>
<br>
<br>
<div class="moz-cite-prefix">On 02/25/2014 05:52 PM, R0M1 wrote:<br>
</div>
<blockquote cite="mid:1393347159977-4028965.post@n3.nabble.com"
type="cite">
<pre wrap="">Dear Users,
Trying different compilation methods for this model, I found some
discrepancies in the results that I do not explain so far.
With the same .xcos model and .csv input file as in the first post, I
compile using /xcos_simulate/ and /scicos_simulate/:
The plots shows the difference between the results from the two methods.
Any idea on what is causing this ?
Thanks a lot.
Here is the code:
clear
// parameters
data=csvRead('input.csv',';');
input_current=evstr(data(:,1));
size1=length(input_current);
C=1/12900;
R=765;
T=0.0001; // timestep
time=[0:T:(size1-1)*T]'; // in s
end_time=time($)+T; // end time in s
// loading Xcos functions
loadScicos;
loadXcosLibs();
exec(loadpallibs,-1);
// loading model: creates scs_m
importXcosDiagram('graphic_model.xcos')
// first compilation method
scs_m.props.context=strcat(["C=",string(C),"; R=",string(R),";
T=",string(T)"; end_time=",string(end_time)]);
xcos_simulate(scs_m,4) // '4' is to perform compilation
graph_voltage_1=graph_voltage.values; // output variable
// second compilation method
%scicos_context.C=C;
%scicos_context.R=R;
%scicos_context.T=T;
%scicos_context.end_time=end_time;
Info=scicos_simulate(scs_m,list(),%scicos_context,flag='nw');
graph_voltage_2=graph_voltage.values; // output variable
set("current_figure",10)
plot(time,graph_voltage_1,'-b')
plot(time,graph_voltage_2,'-r')
xtitle('graph title','time (s)','voltage (V)');
hl=legend(['xcos_simulate';'scicos_simulate'],"in_upper_right");
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</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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