[scilab-Users] Some questions about Xcos

[ray joseph]

Serge,

Thank you for the detailed response.  This really helps me as a new comer
understand Scilab and Xcos better.

If you would please, explain a little more about an Xcos library.  You
pointed out that we could build blocks but not libraries.  What is
unique/special about a library?

Ray

----- Original Message ----- 
From: "Serge Steer" <Serge.Steer at scilab.org>
To: <users at lists.scilab.org>; <clement.david at scilab.org>
Sent: Tuesday, May 11, 2010 2:33 AM
Subject: Re: [scilab-Users] Some questions about Xcos


> Andrea.Amorosi76 at gmail.com a écrit :
> > <div class="moz-text-flowed" style="font-family: -moz-fixed">Hi to all,
> > I'm a Simulink user and I would like to switch to Xcos.
> > So I have the following questions:
> > 1) is it possible to run a simulation in a soft real time mode?
> Yes, select the "Simulation/Setup" Menu
> > 2) is it possible to select a fixed step solver (Euler, Runge-Kutta 4,
> > etc)?
> No in the simulation context, but it is possible (and easy) to a new
> block based on generated C code that embed fixed step solver.
>
> Hybrid asynchronous dynamical system requires high quality solvers
> which, in particular, have root finding capabilities, so it has been
> decided to base the Xcos/Scicos simulator on the Sundials library (CVODE
> and IDA).
> If one wants to check the behavior of a model with a fixed step solver,
> he may use the code generator which generates a new block using
> internaly a fixed step solver. This way it is possible to compare tthe
> results.
> > 3) is it possible to send and receive udp packet and/or interface with
> > a joystick?
> There is no pre defined block for that, but if you know the API of the
> driver is should be easy to developp a block for that.
>
> > 4) is it possible to generate c/c++ code from a model?
> Yes, use the "Tools/Code generation" menu. It will generate C code
> (standalone or new Xcos block)
> > 5) can I create additional blocks libraries?
> The answer here is yes and no:
>  It is possible to create new blocks using the "user defned blocks" in
> particular the CBLOCK (which allow to interactively define a new block
> based on C code), The EXPRESSION block (which allow to interactively
> define a new functionnal block), ...
>
> But it is not yet possible (it is a Scicos feature which is not yet
> implemented in the xcos editor) to create a new block library from
scratch.
> > 6) is there any mechanism similar to the referenced model of
> > Matlab/Simulink?
> No
>
> Thanks for your interest
>
> Serge Steer
> INRIA
>