[Scilab-users] Help to understand XCOS

[Clément David]

Hello Eddie,

To clarify and give you a broader view, in Xcos you are basically
managing :
 * inputs / outputs : propagate the data
 * events : control the data flow
 * states : that represent data *inside* a block

In the integral block, we have a state containing the "integral of
previous values" and the initial value is by default equal to zero.

If you set the initial state to another value, the initial starting
point will vary however we can not "predict" your ideal initial value ;
it depends on your system !

As an example, on the Lorenz demo you can change the initial values and
this will give completely different results (and plots) but the system
is the same !

Note: the plot works like the traditional scope, it just read the
inputs at the given frequency and that's it. It will not hide or show
you anything else (thinks about sub-sampling issues).

Regards,

--
Clément

Le jeudi 08 octobre 2015 à 12:11 -0300, Eddie Liberato a écrit :
> Hello Clément, thanks for the answer. 
> 
> But "make it plot how it should" was not the point. I was trying to
> understand why It don't plot how it should. (I'm not a scientist,
> just a mechanic). I got myself thinking: if it wasn't a function that
> I already know, or in a complex block I could think the result is
> numerically right, when it's not. 
> 
> Thanks Anyway.  
> 
> On Mon, Oct 5, 2015 at 5:08 AM, Clément David <
> clement.david at scilab-enterprises.com> wrote:
> > Hello eddie,
> > 
> > See http://math2.org/math/integrals/more/restrig.htm
> > 
> > In fact you can move the starting point by changing the '1/s'
> > initial
> > value (which is by default 0).
> > 
> > Regards,
> > 
> > --
> > Clément
> > 
> > Le samedi 03 octobre 2015 à 09:49 -0700, eddie Liberato a écrit :
> > > Hi,
> > >
> > > Going straight to the point, I don't understand why Xcos mess
> > with
> > > the
> > > amplitude when integrating the sine function. It shouldn't only
> > go
> > > 90° out
> > > of phase?
> > > Someone can point where is my mistake ?
> > > thanks in advance.
> > >
> > > <http://mailinglists.scilab.org/file/n4032956/54.png>
> > >
> > >
> > >
> > > --
> > > View this message in context:
> > > http://mailinglists.scilab.org/Help-to-understand-XCOS-tp4032956.
> > html
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