The set of slides is prepared for the Tech Talk Tuesday on 21 July 2015.

1. LEE Kar Heng, Ph.D
Chief, TBSS Group
SCILAB IN VIETNAM
An Introduction to Scilab
for
Tech Talk Tuesday, Ho Chi Minh City

2. 2
SCILAB ENTERPRISES
• Founded in June 2010
• The official publisher and professional services provider of
Scilab software
• Provides expertise in the implementation of optimal
solutions in terms of technological innovation and helping
companies to make the right decisions in computation and
simulation tools
• Our team is comprised of engineers and doctors of science
from higher education schools or universities, graduated in
mathematics, automation, telecommunications, physics or
computer science
• http://www.scilab-enterprises.com/

3. 3
THE TBSS-SCILAB PARTNERSHIP
• TBSS became the business partner for
Singapore and Vietnam of Scilab in 2013.
• In 2014, TBSS-Scilab Singapore was
incorporated to handle the Scilab business in
Singapore.
• In Vietnam, the business is represented by
TBSS Khai Kinh Company Limited.
• http://www.scilab-
enterprises.com/partners/ourpartners

4. 4
THE TBSS-SCILAB PARTNERSHIP
• Oversees and Manages Scilab activities in
– Training and Education
– Project and Consultancy
– Migration and Deployment
– Specialized Developments
– Scilab User Group Management, Operations and
Support
• Manages, administers and funds the Singapore
and Vietnam Scilab User Groups
• Manages Scilab projects in Singapore and
Vietnam

5. 5
THE SCILAB CHALLENGE PROJECT
• Scilab Challenge 2014/2015 requires students to work
on a project that uses Scilab as the main scientific tool
in the simulation and computation of the solution to
the problem they are investigating
• Top 3 projects will be presented with cash prize,
certificate and medal
• All participants will be presented certificate and medal
• Identified projects will be required to submit a
technical paper to the ScilabTEC2015 Committee
• The selected project team member will be sponsored
to present the findings at the ScilabTEC Conference in
Paris
• In May 2015, one project was presented at ScilabTEC

6. 6
PROJECT OBJECTIVES
• To promote use of Scilab in academic
institutions, currently Scilab-Singapore have
challenge projects with NTU and TP
• To facilitate the use of Scilab to solve a specific
problem
• To enable the students appreciate Scilab
• To provide a channel for students to present
findings in the ScilabTEC conference, Paris
• To reward capable students accordingly

7. BENEFITS
• Scilab is an open-source software, hence there
is NO licensing issue
• Gain skillset in use of Scilab
• Participation in project gives advantage in
seeking employment
• Participation in international conference is
widely accepted as a professional recognition
• Possibility to work for Scilab Enterprise, TBSS-
Scilab or other Scilab partners
7

8. 8
• The conference was held from 20 to 21 May in Paris
• TBSS was represented by Dr Lee and Miss Li Kexin
• Le would be presenting the project “Taxi on the
Way”
• Lee would be meeting the management staff of
Scilab and confirming the representation of new
products in Singapore and/or Vietnam

9. 9
• The presented
topics covered a
wide range of
specialized areas
• The TBSS team
learned how
Scilab has been
used by other
professionals
• It was a great
program with
knowledge
sharing and
networking

10. 10
• Lee with Jocelyn, the Marketing Director who is
the first contact of Lee in Scilab
• Jocelyn had
facilitated the
partnership
between TBSS and
Scilab

11. 11
• Lee visited Scilab in Jan 2014 and got
acquaintance with Dr Gomez and Ms Julie
• Dr Gomez is the
Advisor and
immediate past
CEO of Scilab
• Ms Julie is the
Communications
and Public
Relations Manager
of Scilab

12. 12
• Mr Aphan took over Scilab
recently
• Lee had a good meeting with
Mr Aphan on the progression
of the partnership in terms of
training, 3rd party products
and Scilab Academy in Asia.

13. 13
• Kexin presented the project with good presentation
slides and confident.

14. 14
• TBSS practices Corporate Social Responsibility
• Scilab Challenge is an initiative that allows outreach
of Scilab and provision of opportunity for students
to experience knowledge sharing in international
events
• https://www.facebook.com/groups/TBSSCharity/

15. SUPPORT
• Community support
– TBSS-Scilab User Group at Facebook (General enquiries on
Scilab)
– Specific project Facebook group, example: the Scilab
Challenge@NTU 2014/2015 (Project related matters,
announcement, …)
• Contact
– Lee Kar Heng (karheng@tbssc3e.com) (project matters)
– Tan Thiam Huat (tanthiamhuat@e.ntu.edu.sg) (Scilab
matters)

16. 1 - Scilab made by Inria
2003 – 2007: Scilab Consortium phase 1 (Inria)
2008 – 2012: Scilab Consortium phase 2 (DIGITEO Foundation)
2008: Free Scilab (GPL compatible)
2009: Xcos industrialization
1980: first MATLAB
1980 – 1990: BASILE software at Inria / Simulog
2010: Transfer to Scilab Enterprises Company
2012: Exclusivity of trademark, development and publishing of Scilab
1990 – 2003: Open Source Scilab (Research)
Scilab freely distributed on the Net in 1994
2 - Scilab industrialization
3 – Scilab Enterprises
HISTORY

17. • Scilab
Powerful Computation Engine
• Xcos
Dynamic Systems Modeling and
Simulation
• ATOMS (AuTomatic mOdules
Management for Scilab)
Module Management
SCILAB DISTRIBUTION

18. • High level
programming language
• Hundreds of
mathematical functions
• Advanced data
structures & user-
defined data types
• Computation engine
easy to embed into
applications
• Open System:
extended capabilities
with professional &
specialized modules
SCILAB: FREE AND OPEN SOURCE

19. • Mathematical functions
• Matrix computation, sparse
matrices
• Polynomials and rational
functions
• Simulation: ODE and DAE
• Classic and robust control, LMI
optimization
• Differentiable and non
differentiable optimization
• Interpolation, approximation
• Signal processing
• Statistics
• Xcos: hybrid dynamical systems
modeler and simulator
More than 2,000 functions:
KEY SCIENTIFIC FEATURES

20. • Dynamic System Modeling and
Simulation
• A user-friendly GUI-based editor
for modeling and simulating hybrid
dynamical systems as block
diagrams: model construction,
edition and customization
• Integrated Modelica Compiler
• Freely Available and distributed
with Scilab
XCOS

21. • Graphically model, compile, and simulate dynamical
systems
• Combine continuous and discrete-time behaviors in the
same model
• Select model elements from Palettes of standard blocks
• Program new blocks in C, Fortran, or Scilab language
• HDF5 standard which has been chosen to guarantee data
exchanges between Scilab and Xcos Editor
• Free Modelica compiler which enables the simulation of
implicit diagrams
• Graphical user interface based on JGraphX
XCOS MAIN FEATURES

22. Variable
Browser
File Browser
Command
History
Console
PROGRAMMING ENVIRONMENT

23. 2-D/3-D VisualizationEditor
Embedded Help
External Modules
Manager
Variable Editor
PROGRAMMING ENVIRONMENT

24. • Great number of
functionalities to create
Graphical User Interfaces
• Accessible from Scilab
• Interaction between GUI and
plots
• Fully integrated in OS
environment
GRAPHICAL USER INTERFACES

25. What’s new?
• Graphics: speed (Matplot), datatips,
interactions, 3-D lightning
• Graphical User Interface: new UI
Controls
• Remote file Access (sciCurl)
• Scilab/MPI (Message Passing
Interface)
• Java Integration (JIMS)
• HDF5 management
• Localization of external modules
Works under Windows XP/Vista/7/8,
GNU/Linux and Mac OS X, 32 bits and
64 bits
LATEST RELEASE SCILAB 5.5.2

26. • Management of C, C++, Fortran, Java, Python,
.net... from Scilab: JIMS module for Java
• Available as a computing engine with C, C++,
Java, Python, .net API...
• Links with:
– Excel®, COM/DCOM® (Microsoft),
– Labview® (National Instruments),
– Isight® (Dassault Systèmes),
– Alternova® (Eurodecision),
– modeFRONTIER® (ESTECO),
– etc.
• [Video] Interface Scilab to Arduino
LINKS WITH OTHER LANGUAGES

27. About 100,000 monthly downloads from 150
countries on www.scilab.org
DOWNLOADS

28. 28
DOWNLOADS

29. Main industrial sectors
• Aerospace: Airbus Group, CNES,
Safran, Dassault Aviation
• Transportation: Renault, LEONI,
Siemens, Alstom, Faurecia
• Mechanical: ArcelorMittal, Aperam
• Energy: EDF, RTE, CEA, Total, IFP
• Defence: DGA, THALES
• Health: SANOFI
• Telecom: Orange
• Earth Science: BRGM, Eramet
Academics, education
 High schools (French high
schools)
 Engineering schools (TP, …)
 Universities (HCMUT, NUT,
SUTD, …)
In red: Scilab Enterprises customers
USERS

30. Scilab is free software
– Easy to install everywhere
– Large community of users
But freedom is not enough
A friendly software with a lot of functionalities
– Included toolboxes for most of applied mathematics
– Own dedicated OpenGL graphics
– Xcos comparable to Simulink
– Easy to add interactively external module
A comprehensive organization takes care of Scilab
– Scilab developed professionally by Scilab Enterprises
– Supports and services
– IPC Scilab Users Group with important Companies
CHANGING TO SCILAB

31. Scilab is not a clone of Matlab
• Very similar languages
• Same simple graphics functions: plot, bar, mesh, pie, surf
• But different syntax and semantics for many functions:
- Syntax example: “eigen” vs. “spec”
- Semantics example: “max” function
- Different management of source files
Matlab / Scilab dictionary available in the Scilab help
SCILAB … MATLAB

32. • Matrix computations:
A=rand(1000,1000); b=rand(1000,1);
x=Ab; norm(A*x-b)
vp=spec(A);
• 2D plots:
plot(real(vp),imag(vp),"*r");
x=linspace(-%pi,%pi,1000);
clf; plot(x,sin(x),"r",x,cos(x),"g");
 3D curve:
k=tan(%pi/27);t=linspace(-40,40,1000);
x=cos(t)./cosh(k*t); y=sin(t)./cosh(k*t); z=tanh(k*t);
clf; param3d(x,y,z);
SCILAB AS A CALCULATOR

33.  3D beautiful surface: 90,000 points
function z=f(x,y) // function defining the surface
z=exp(exp(-x^2-y^2)*(exp(cos(x^2+y^2)^20)+..
8*sin(x^2+y^2)^20+2*sin(2*(x^2+y^2))^8));
endfunction
x=linspace(-1.5,1.5,300); y=linspace(-1.5,1.5,300); z=feval(x,y,f);
f=scf(0); f.color_map=rainbowcolormap(32);
surf(x,y,z); // plot the surface
e=gce(); e.color_mode=-1;
a=gca(); a.box="off";
a.axes_visible=["off","off","off"];
a.x_label.visible="off";
a.y_label.visible="off";
a.z_label.visible="off";
SCILAB AS A CALCULATOR

34. To plot data in 2D with color according to the value of the points, modify
data and then plot again
Data are given in text file mandel.txt (2 million points, 19 Mb).
1. Put data into Scilab matrix M:
M=fscanfMat("mandel.txt");
2. Open graphics window, choose beautiful colormap and plot
points according to its value:
f=scf(1); f.color_map = rainbowcolormap(256);
Matplot(M);
3. Discard points with value between 50 and 210 and plot in another
window:
M(find(50<M & M<210))=1;
f=scf(2); f.color_map = rainbowcolormap(256);
Matplot(M);
SCILAB AS A PLOTTING TOOL

35. First plot Second plot
Plotting is instantaneous:
SCILAB AS A PLOTTING TOOL

36. To read text file takes time:
M=fscanfMat("mandel.txt"); // 5 seconds
1. Save matrix into binary SOD (Scilab Open Data) based on HDF5
standard:
save("mandel.sod","M"); // 0.04 second
2. Loading into Scilab is now very fast:
load("mandel.sod"); // 0.1 second
SCILAB FILE HANDLING

37. • Friendly editor, powerful mathematical language close
to natural language:
function u=Newton(f,fprim,u0,eps)
u=u0;
while abs(f(u))>eps then
fp=fprim(u);
if abs(fp)<=%eps then
error("singularity")
end
u=u-f(u)/fp
end
endfunction
 About 1,300 Scilab functions are written in Scilab
SCILAB PROGRAMMING

38. function x=Gauss(A,b,eps)
n=size(b,"*"); x=b;
for k=1:n-1
// when the diagonal term is close to 0
// searching for a non zero element in the column
if abs(A(k,k))<eps then
kk=find(abs(A(k:n,k))>eps);
if kk==[] then
disp(“Non invertible Matrix");
return;
end
// exchanging lines k and kk in A and in b
kk=kk(1);
lignek=A(k,:); A(k,:)=A(kk,:); A(kk,:)=lignek;
lignek=b(k); b(k)=b(kk); b(kk)=lignek;
end
Gaussian elimination with partial pivoting:
Scilab vectorized syntax
SCILAB PROGRAMMING
// Gauss algorithm
for l=k+1:n
p=A(l,k)/A(k,k);
for m=k:n
A(l,m)=A(l,m)-A(k,m)*p;
end
x(l)=x(l)-x(k)*p;
end
end
if abs(A(n,n))<eps then
disp("Non invertible Matrix ");
return;
end
// compute x
x(n)=x(n)/A(n,n);
for i=n-1:-1:1
s=0;
for j=i+1:n
s=s+A(i,j)*x(j);
end
x(i)=(x(i)-s)/A(i,i);
end
endfunction

39. Save and load GUI as XML files
:
• Save GUI with:
saveGui(f,"mygui.xml");
• Load GUI with:
f=loadGui("mygui.xml");
New components, speed, default look and feel of the OS
GUI WITH SCILAB 5.5.2

40. Scilab
is
The Professional Free
Software for Numerical Computation
Industry, Education and Research