Cape2013 scilab-workshop-19Oct13
Download as PPTX, PDF0 likes3,706 views
This document outlines a presentation given at the National Conference on Advances in Process Engineering (CAPE-2013) about Scilab, an open-source computing tool. The presentation covers the basics of Scilab including variables, matrices, functions, control statements, plotting, and file operations. It also describes 12 tutorials that demonstrate key Scilab capabilities like matrix calculations, solving equations of motion, finding polynomial roots, and using loops and conditionals. The goal is to help engineers learn Scilab syntax and programming skills to complement their education.
![Matrices
• Every variable is n dimension in nature
– No need to specify the dimensions / length / size
19-Oct-13 Scilab - A Computing Tool for Engineers 8
h = [ 1 24 -5]
-->h = [1 24 -5]
h =
1. 24. - 5.
-->h = 1;
-->h(1,2) = 24;
-->h(1,3) = - 5;
-->h
h =
1. 24. - 5.
-->h = [1 24];
-->h(1,3) = - 5;
-->h
h =
1. 24. - 5.](https://image.slidesharecdn.com/cape2013-scilab-workshop-19oct13-131021085816-phpapp01/85/Cape2013-scilab-workshop-19Oct13-8-320.jpg)
![Matrices Cont.
19-Oct-13 Scilab - A Computing Tool for Engineers 9
-->x = [2 -3 4; 5 10 24]
x =
2. - 3. 4.
5. 10. 24.
-->x = [2 -3 4];
-->x(2,:) = [5 10 24];
-->x
x =
2. - 3. 4.
5. 10. 24.
-->x(2,:) = [5 10 24];
-->x
x =
0. 0. 0.
5. 10. 24.
-->x(1,:)=[2 -3 4]
x =
2. - 3. 4.
5. 10. 24.](https://image.slidesharecdn.com/cape2013-scilab-workshop-19oct13-131021085816-phpapp01/85/Cape2013-scilab-workshop-19Oct13-9-320.jpg)
Cape2013 scilab-workshop-19Oct13
- 1. P. R. Naren School of Chemical & Biotechnology (SCBT) prnaren@scbt.sastra.edu at National Conference on Advances in Process Engineering CAPE-2013 SASTRA University Thanjavur, Tamilnadu 613 401 INDIA 19th October 2013 Progress Through Quality Scilab – A Computing Tool for Engineers
- 2. Why are we here? • To learn about Scilab – Syntax – Advantages – Limitation • To master programming skills • To become efficient programmer 19-Oct-13 Scilab - A Computing Tool for Engineers 2 Familiarize programming tool Scilab and complement our learning process !
- 3. Outline • What is Scilab ? • Basics – Variables, Matrices, – Std. I/O function • Linear algebra • Functions and Subroutines • Control / Looping statements • ODE • File operations and GUI • Plot Functions 19-Oct-13 Scilab - A Computing Tool for Engineers 3
- 4. Scilab • Computing tool – Scripts / programming environment – Mathematical operations A place where we can compute / calculate !!! Numerically solve equations • Free and Open source http://www.scilab.org – Free to download – Lot of help material available over net http://help.scilab.org/docs/5.4.1/en_US/index.html 19-Oct-13 Scilab - A Computing Tool for Engineers 4
- 5. Familiarization • Version 5.4.1 19-Oct-13 Scilab - A Computing Tool for Engineers 5 Console Variable List Command History File Browser
- 6. Basic Operators and Functions 19-Oct-13 Scilab - A Computing Tool for Engineers 6 • Operators : +, -, *, /, ^ • sqrt • %e • %i • %pi • log – This is based on “e” - Natural logarithm • log10 • Colon “:” operator • sin cos tan – sind cosd tand – asin acos atan • factorial • sum • product • Relational – > >= < <= == ~= <> • Logical – & | ~
- 7. Variables • No class/type definitions or declarations 19-Oct-13 Scilab - A Computing Tool for Engineers 7 -->a = 3; -->a a = 3. -->a = "Workshop"; -->a a = Workshop
- 8. Matrices • Every variable is n dimension in nature – No need to specify the dimensions / length / size 19-Oct-13 Scilab - A Computing Tool for Engineers 8 h = [ 1 24 -5] -->h = [1 24 -5] h = 1. 24. - 5. -->h = 1; -->h(1,2) = 24; -->h(1,3) = - 5; -->h h = 1. 24. - 5. -->h = [1 24]; -->h(1,3) = - 5; -->h h = 1. 24. - 5.
- 9. Matrices Cont. 19-Oct-13 Scilab - A Computing Tool for Engineers 9 -->x = [2 -3 4; 5 10 24] x = 2. - 3. 4. 5. 10. 24. -->x = [2 -3 4]; -->x(2,:) = [5 10 24]; -->x x = 2. - 3. 4. 5. 10. 24. -->x(2,:) = [5 10 24]; -->x x = 0. 0. 0. 5. 10. 24. -->x(1,:)=[2 -3 4] x = 2. - 3. 4. 5. 10. 24.
- 10. Script Files • Script file – .sce – .sci e - executable i – functions e – main script files i - for functions or sub-rountines • “//” comment a statement – Good programing etiquettes ! • clc • clear 19-Oct-13 Scilab - A Computing Tool for Engineers 10
- 11. Tutorials 19-Oct-13 Scilab - A Computing Tool for Engineers 11 • Tut1: Product of two nos. • Tut2: Product of two nos. + user input • Tut3: Matrix calculations based on user choice • Tut4: Matrix calculations based on user choice with condition check • Tut5: Spline curves • Tut6: Building blocks • Tut7: Equation of motion : v • Tut8: Equation of motion: v and x • Tut9: Roots of polynomial • Tut10: Smart Input for Tut4 • Tut11: Write output into text file • Tut12: Sum on n numbers • Tut1: Print statements • Tut2: Input function • Tut3: Switch case • Tut4: If then else • Tut5: Plot functions • Tut6: Function (Sub routines) • Tut7: ODE function : I order • Tut8: Simultaneous ODE : Two I order • Tut9: Inbuilt function fsolve • Tut10: GUI • Tut11: File operations • Tut12: For looping
- 12. Tutorial 1 Multiplication of two numbers (23.4 and 21) and get their product • Objective – General programming structure clear clc different sections in program – Different options for output (result display on console) disp mprintf Tutorial-1 Script File 19-Oct-13 Scilab - A Computing Tool for Engineers 12
- 13. Tutorial 2 Multiplication of two numbers (user input) and get their product • Objective – input function Obtain user input and then perform computation Makes program more generic reusable !! Tutorial-2 Script File 19-Oct-13 Scilab - A Computing Tool for Engineers 13
- 14. Tutorial 3 Perform operations on matrix based on user choice • Objective – Control statement – “select – case – end” Obtain two matrices from user Perform arithmetic operations on the matrices based on user choice – Add two matrix – Matrix multiplication – Element wise multiplication Tutorial-3 Script File 19-Oct-13 Scilab - A Computing Tool for Engineers 14
- 15. Tutorial 4 Perform operations on matrix based on user choice with conditional check • Objective – Control statement – “if - then – else - end” Obtain two matrices from user Perform arithmetic operations on the matrices based on user choice – Add two matrix / Matrix multiplication / Element wise multiplication Check whether the user entered value is within bounds / range !! Tutorial-4 Script File 19-Oct-13 Scilab - A Computing Tool for Engineers 15
- 16. Tutorial 5 Plot splines • Objective – Plot functions Generate equi-spaced data (data range) Generate splines – Smooth polynomial Plot the generated spline to know its nature Tutorial-5 Script File 19-Oct-13 Scilab - A Computing Tool for Engineers 16
- 17. Tutorial 6 Building Block • Objective – Use of sub-routines or functions Define function once and call it wherever required Given dimensions of unit building block how many blocks are required to build a wall Tutorial-6 Script File 19-Oct-13 Scilab - A Computing Tool for Engineers 17
- 18. Tutorial 7 Equation of motion : Velocity of a moving body under constant linear acceleration • Objective – Solve first order ODE Equation of motion for a moving body under constant acceleration Acceleration “a” – Constant – Variable Tutorial-7 Script File 19-Oct-13 Scilab - A Computing Tool for Engineers 18 0 0 t t u u
- 19. Tutorial 8 Equation of motion : Velocity and Location of a moving body under constant linear acceleration • Objective – Solve two first order ODE’s Equation of motion for a moving body under constant acceleration Acceleration “a” – Constant – Variable Tutorial-8 Script File 19-Oct-13 Scilab - A Computing Tool for Engineers 19 0 0 t t u u
- 20. Tutorial 9 Roots of Polynomial • Objective – To determine the roots of polynomial Find x such that f(x) = 0 Quadratic equation – Define f(x) – Guess a value for xroot such that f (xroot) = 0 – Use in-built function fsolve to determine a actual root Tutorial-9Script File 19-Oct-13 Scilab - A Computing Tool for Engineers 20 0 0 t t u u 2 0 1 2 f (x) a a x a x
- 21. Tutorial 10 Perform operations on matrix based on user choice ! Obtain data in Smart Way ! • Objective – Use of simple GUI function to obtain data Avoids error previously encountered in Tutorial 4 ! Tutorial-10 Script File 19-Oct-13 Scilab - A Computing Tool for Engineers 21
- 22. Tutorial 11 Write output data into a file • Objective – Use file I/O commands and write result into a file Circular cross section pipe of known (given) diameter D Fluid of known density ( r ) and viscosity ( m ) flowing at specified volumetric flow rate Compute Reynolds no. If Re <= 2100 Flow is laminar 2100 < Re <= 5000 Transition Re > 5000 Turbulent Tutorial11-File-operation.sce 19-Oct-13 Scilab - A Computing Tool for Engineers 22 Du Re r m
- 23. Tutorial 12 Sum on N numbers • Objective – Use looping statement – For loop Determine the sum of N numbers Tutorial12-File-operation.sce 19-Oct-13 Scilab - A Computing Tool for Engineers 23 N i i 1 S x
- 24. To Sum Up • Scilab as computing tool for engineers • Basic arithmetic operations • Computing abilities in Scilab • Generic programming etiquette • Use Tutorials and Web documents • Improvise, learn (re-learn / un-learn) • Use Scilab to complement your engineering education 19-Oct-13 Scilab - A Computing Tool for Engineers 24
- 25. Gratitude • CAPE-2013 – For this wonderful opportunity • PR Team for their registration spree !! • Technical and Infra support team • Audience 19-Oct-13 Scilab - A Computing Tool for Engineers 25
- 26. 19-Oct-13 Scilab - A Computing Tool for Engineers 26 THANK YOU A person who never made a mistake never tried anything new - Albert Einstein - 1879 -1955 Entities must not be multiplied beyond necessity - William of Ockham - 12th A.D.
Editor's Notes
- #6: Console: Simple arithmetic operations can be directly performed on console / Output is displayed on console Command history stores all commands from console ! Variable browser window lists all the variable that are currently in use
- #8: Semi-colon “;” is used to suppress printing / display on the command window. For instance, command “a=3” assigns 3 to variable “a” and also displays the output on console In contrast, “a=3;” assigns 3 to variable a but suppress the display on console
- #9: Q: How to retrieve the elements of matrix? Extraction of elements from matrix Colon “:” operator