[Scilab-Dev] Documentation for Xcos

Wed Feb 24 08:09:59 CET 2016

Thanks for your reply,

I used the function that you mentioned and created the following class.

package org.scilab.modules.xcos;

public class TestingXcos {
public static void main(String args[]){
Xcos.xcos(null, 0);
}
}

However, I get a runtime exception, with the following message.

Exception in thread "main" java.lang.ExceptionInInitializerError
at org.scilab.modules.core.Scilab.<clinit>(Scilab.java:65)
at org.scilab.modules.xcos.Xcos.<clinit>(Xcos.java:116)
at org.scilab.modules.xcos.TestingXcos.main(TestingXcos.java:5)
Caused by: java.lang.RuntimeException: XPathFactory#newInstance() failed to
create an XPathFactory for the default object model:
http://java.sun.com/jaxp/xpath/dom with the
XPathFactoryConfigurationException:
javax.xml.xpath.XPathFactoryConfigurationException:
java.util.ServiceConfigurationError: javax.xml.xpath.XPathFactory:
jar:file:/C:/Users/Adhitya/Documents/GitHub/scilab/Windows/thirdparty/saxon9he.jar!/META-INF/services/javax.xml.xpath.XPathFactory:2:
Illegal configuration-file syntax
at javax.xml.xpath.XPathFactory.newInstance(XPathFactory.java:102)
at
org.scilab.modules.commons.xml.ScilabXPathFactory.newInstance(ScilabXPathFactory.java:56)
at
org.scilab.modules.commons.xml.XConfiguration.<clinit>(XConfiguration.java:86)
... 3 more

I've seen that there has been a similar issue in the past:
http://bugzilla.scilab.org/show_bug.cgi?id=13854

I also saw this bug related to saxon9he.jar over here:
https://sourceforge.net/p/saxon/mailman/message/33221102/

After that, I downgraded from Java 8 to Java 7 with the hopes of getting it
to work. Still I get the same message.

Am I missing something? Could you please help me out?

Thanks,

Adhitya

On Fri, Feb 19, 2016 at 6:26 PM, Clément David-2 [via Scilab / Xcos -
Mailing Lists Archives] <ml-node+s994242n4033513h44 at n3.nabble.com> wrote:

> Hi,
>
> > ---- 1 ----
> >
> > As a part of my reverse engineering process, I have started from the
> point where Xcos application
> > is invoked, when the button is pressed in the MenuBar.
> >
> > If possible, could you explain the StoreCommand() function? I see that
> all incoming commands are
> > en-queued in the commandQueue, to be processed one by one. But where in
> the code, is the command
> > getting de-queued for parsing?
>
> In fact, the commandQueue is the way to communicate to the Scilab
> interpreter engine. When you
> request an execution, the command is stored on the queue and latter the
> engine pick the command and
> execute it.
>
> When hitting the "Play" button on xcos, we push the diagram to the Scilab
> workspace and put an
> 'xcos_simulate' call to be executed.
>
>
> > ---- 2 ----
> >
> > The command that is given in /etc/main_menubar.xml for opening Xcos is
> >
> > if with_mode ('xcos') then xcos();
> > else disp(gettext('Please install xcos module'))
> >
> > Would it be possible for you to point where xcos() is invoked after
> interpretation and parsing?
> >
> > Hypothetically for instance, if I were to create a new method in Java,
> so that I can see the Block
> > Diagram Editor, like this -
> >
> > public static void main (String args[]){
> >     Xcos xcos = new Xcos(); //Assuming I can write something like this
> > }
> >
> > If this is possible, I would like to know, which is that particular
> 'XCos' Class that can allow me
> > to do this?
>
> On the xcos module, there is an 'Xcos.java' file that contains some
> annotated methods exported to C.
> For instance you can take a look at the Xcos#xcos() method.
>
> --
> Clément
>
> > On Mon, Feb 1, 2016 at 1:02 PM, Clément David-2 [via Scilab / Xcos -
> Mailing Lists Archives]
> > <[hidden email]> wrote:
> > >  Hi Adhitya,
> > >
> > > The code is *the* reference but for more internal views I suggest you
> to read these documents :
> > >
> > > * R. NIKOUKHAH AND S. STEER , Scicos a dynamic system builder and
> simulator, IEEE INTERNATIONAL
> > > CONFERENCE ON CACSD, DEARBORN , MICHIGAN , 1996.
> > > * S. STEER , R. NIKOUKHAH , Scicos: a hybrid system formalism, ESS’99,
> E RLANGEN , GERMANY ,
> > > 1999.
> > > * Masoud NAJAFI thesis , The Numerical Solver for the Simulation of
> the Hybrid Dynamical
> > > Systems
> > > , 2005 .
> > >
> > > And for understanding what's behind each block, take a look at the
> Scilab documentation, and
> > > ScilabTec presentations.
> > >
> > > Regards,
> > >
> > > --
> > > Clément
> > >
> > >
> > > Le vendredi 29 janvier 2016 à 23:31 -0700, adhitya a écrit :
> > >
> > > > Hi,
> > > >
> > > > My name is Adhitya Kamakshidasan and I'm an Intern at FOSSEE, IIT
> Bombay.
> > > >
> > > > We are trying to develop a standalone version of Xcos, that is
> completely
> > > > web-based.
> > > >
> > > > I would like to know if there is any documentation with respect to
> how Xcos
> > > > has been written - Flowcharts, Main methods, PDF's, etc.
> > > >
> > > > Currently, I'm trying to reverse-engineer the code, by slowly moving
> through
> > > > the code, and removing the parts that are not related to Xcos.
> However, this
> > > > is taking a lot of time.
> > > >
> > > > We would like your support in this regard.
> > > >
> > > > Thanks,
> > > >
> > > > Adhitya Kamakshidasan
> > > >
> > > >
> > > >
> > > > --
> > > > View this message in context:
> http://mailinglists.scilab.org/Documentation-for-Xcos-tp4033357.
> > > html
> > > > Sent from the Scilab developers - Mailing Lists Archives mailing
> list archive at Nabble.com.
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