Introduction to Scilab Use Scilab, not Matlab
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1 Introduction to Scilab Use Scilab, not Matlab Kannan M. Moudgalya IIT Bombay Scilab-Arduino Workshop IIT Bombay 3 July 2015 Kannan Moudgalya Use Scilab, not Matlab 1/68
2 Outline Open Source Software History of Scilab Usage of Scilab Comparing other open source software systems Kannan Moudgalya Use Scilab, not Matlab 2/68
3 FOSS: Free and Open Source Software Commercial software is expensive Heavy penalties if unauthorised software is used by industry Stories from Italy, HLL, WIPRO Our SME s don t use ANY software: commercial software is expensive they are not aware of open source software Makes small companies uncompetitive There is no alternative to open source software Kannan Moudgalya Use Scilab, not Matlab 3/68
4 Scilab A good substitute for Matlab About 95% compatibility Kannan Moudgalya Use Scilab, not Matlab 4/68
5 What is Scilab? Free and open source Easy to use Excellent computational environment: LINPACK, EISPACK, LAPACK: same as Matlab Other software not available for Matlab: Dassl, ODEPACK, etc. Kannan Moudgalya Use Scilab, not Matlab 5/68
6 Scilab is created for mathematicians Matrices and vectors can be created easily - no typing, storage allocation, etc. Matrix-vector product, scalar-vector/matrix products are written without any fuss - like the mathematicians do Belongs to Matlab family - originally created by Prof. Cleve Moler, who had worked on Linpack and Eispack projects Kannan Moudgalya Use Scilab, not Matlab 6/68
7 History of Scilab Prof. Cleve Moler created Matlab through NSF funding As Government funded, source code had to be made available Many companies started using this idea Matrixx CTRL-C Matlab Scilab Used extensively for linear algebra, simulation, control system design Scilab - a recent story Kannan Moudgalya Use Scilab, not Matlab 7/68
8 Scilab - other features Can call programs written in Fortran, C Good graphics capability Large installed base A lot of algorithms implemented in interpreted language as well Free Check out or Kannan Moudgalya Use Scilab, not Matlab 8/68
9 How reliable is Scilab? CNES - France s ISRO CNES Arianne rockets CNES relies on Scilab for many critical calculations: trajectory, flight dynamics, orbit Kannan Moudgalya Use Scilab, not Matlab 9/68
10 CNES Talk Use of Scilab for Space Mission Analysis and Flight Dynamics Activities by Thierry Martin Senior Manager, CNES Kannan Moudgalya Use Scilab, not Matlab 10/68
11 Purchase of Matlab at IIT Bombay - A Story Kannan Moudgalya Use Scilab, not Matlab 11/68
12 Usage of Scilab Kannan Moudgalya Use Scilab, not Matlab 12/68
13 Simple Arithmetic - 1 ans = Kannan Moudgalya Use Scilab, not Matlab 13/ ans = 22. a = 4, b = 6; c = 12 a = 4. c = 12. a+b+c
14 Useful Commands demos apropos Gives demos on several different things Helps locate commands associated with a word help functional invocation with no arguments diary Helps draw plots Stores all commands and resulting outputs Kannan Moudgalya Use Scilab, not Matlab 14/68
15 Simple Arithmetic & Display a = 4; b = 6; c = 12; d = a+b+c d = 22. d = a+b+c; d d = 22. Kannan Moudgalya Use Scilab, not Matlab 15/68
16 Simple Arithmetic x = sqrt(2)/2, y = asin(x) x = y = y_deg = y * 180 /%pi y_deg = 45. Kannan Moudgalya Use Scilab, not Matlab 16/68
17 Vector Operation - 2 I -->a = 1:5, b = 1:2:9 a =! ! b =! ! -->c = [b a] c =! Kannan Moudgalya Use Scilab, not Matlab 17/68
18 Vector Operation - 2 II -->d = [b(1:2:5) 1 0 1] d =! ! Kannan Moudgalya Use Scilab, not Matlab 18/68
19 Vector Operation - 3 I -->a, b a =! ! b =! ! -->a - 2 Kannan Moudgalya Use Scilab, not Matlab 19/68
20 Vector Operation - 3 II ans =! ! -->2*a-b ans =! ! Kannan Moudgalya Use Scilab, not Matlab 20/68
21 Logical Operators == equal to < less than > greater than <= less than or equal to >= greater than or equal to <> or = not equal to Kannan Moudgalya Use Scilab, not Matlab 21/68
22 Vector Operations Using Logical Operators I -->A = 1:9, B = 9-A A =! B =! >tf = A==B Kannan Moudgalya Use Scilab, not Matlab 22/68
23 Vector Operations Using Logical Operators II tf =! F F F F F F F F F! -->tf = A>B tf =! F F F F T T T T T! Kannan Moudgalya Use Scilab, not Matlab 23/68
24 Transpose I -->c = [1;2;3] c =! 1.!! 2.!! 3.! -->a=1:3 Kannan Moudgalya Use Scilab, not Matlab 24/68
25 Transpose II a =! ! -->b = a b =! 1.!! 2.!! 3.! Kannan Moudgalya Use Scilab, not Matlab 25/68
26 Submatrix I -->A=[1 2 3;4 5 6;7 8 9] A =! !! !! ! -->A(3,3)=0 Kannan Moudgalya Use Scilab, not Matlab 26/68
27 Submatrix II A =! !! !! ! Kannan Moudgalya Use Scilab, not Matlab 27/68
28 Submatrix I A A =! !! !! ! -->B=A(3:-1:1,1:3) Kannan Moudgalya Use Scilab, not Matlab 28/68
29 Submatrix II B =! !! !! ! Kannan Moudgalya Use Scilab, not Matlab 29/68
30 Submatrix -->A A =! !! !! ! -->B=A(:,2) B =! 2.!! 4.!! 8.! Kannan Moudgalya Use Scilab, not Matlab 30/68
31 Submatrix I -->b=[5-3;2-4] b =! !! ! -->x=abs(b)>2 Kannan Moudgalya Use Scilab, not Matlab 31/68
32 Submatrix II x =! T T!! F T! -->y=b(abs(b)>2) y =! 5.!! - 3.!! - 4.! Kannan Moudgalya Use Scilab, not Matlab 32/68
33 Special Matrices I -->zeros(3,3) ans =! !! !! ! -->ones(2,4) Kannan Moudgalya Use Scilab, not Matlab 33/68
34 Special Matrices II ans =! !! ! -->rand(2,1) ans =! !! ! Kannan Moudgalya Use Scilab, not Matlab 34/68
35 Go for Vector Computation Kannan Moudgalya Use Scilab, not Matlab 35/68
36 Go for Vector Computation I -->a = ones(10000,1); -->timer() ans = >for i = 1:10000, b(i)=a(i)+a(i); end -->timer() Kannan Moudgalya Use Scilab, not Matlab 36/68
37 Go for Vector Computation II ans = >c = a+a; -->timer() ans = 0.03 Kannan Moudgalya Use Scilab, not Matlab 37/68
38 Plots Go through the Demos! Kannan Moudgalya Use Scilab, not Matlab 38/68
39 Comparing Matlab and Scilab Capability comparison - a correct question? Is Matlab required for class students? Matlab and versions Mathworks: 2,000 employees Scilab: 23 full time employees Kannan Moudgalya Use Scilab, not Matlab 39/68
40 Hardware Interfacing through FOSS Scilab Xcos, HART, COMEDI GNURadio Kannan Moudgalya Use Scilab, not Matlab 40/68
41 Scilab for Hardware Interfacing COMEDI has device drivers for 150 A/D and Digital I/O cards We can call ALL of them from Scilab Using Xcos ( Simulink), HART Devices not in COMEDI, but with C drivers Devices without device drivers Kannan Moudgalya Use Scilab, not Matlab 41/68
42 GNURadio for Hardware Interfacing Open source software Uses C++ and Python Can call OpenCV Has graphic front end Has sliders, etc. - allows change of parameters in real time Calling Scilab functions from GNURadio Calling Xcos functions from GNURadio LabView does not allow Simulink calls! Kannan Moudgalya Use Scilab, not Matlab 42/68
43 Control of Single Board Heater System through Scilab and GNURadio Kannan Moudgalya Use Scilab, not Matlab 43/68
44 Thanks Kannan Moudgalya Use Scilab, not Matlab 44/68
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