Scilab: Computing Tool For Engineers

Scilab: Computing Tool for Engineers
P. R. Naren
School of Chemical & Biotechnology
SASTRA University
E-mail: prnaren@scbt.sastra.edu
National Conference on Advances in Process Engineering
CAPE-2015
SASTRA University
Thanjavur, Tamilnadu 613 401 INDIA
9th October 2015
Progress Through Quality Education

Why are we here?
• To learn about Scilab
– Syntax
– Advantages
– Limitation
• To master programming skills
• To become efficient programmer
Familiarize
programming tool
Scilab
and
complement our
learning process !
9-Oct-15 Scilab - A Computing Tool for Engineers
2

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
3

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://wiki.scilab.org/
http://help.scilab.org/docs/5.5.2/en_US/index.html
4

FOSSEE Project
• Free and Open Source Software for Education
• FOSSEE on Scilab: http://www.scilab.in
– Spoken Tutorials
10 min short videos on scilab functions http://spoken-tutorial.org/
Take workshop and attend objective test
IITB MHRD certificate
– Textbook Companion Project
http://www.scilab.in/Textbook_Companion_Project
 Code all solved examples of standard textbook
– Codes for most textbooks already available – Use and learn !!
Get paid ! Honorarium (INR 12k) from IITB
– Lab Migration Project
Convert lab exercises to Scilab
5

Familiarization
• Version 5.5.2
Console
Variable
List
Command
History
File
Browser
6

Basic Operators and Functions
• 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
-->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
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.
-->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
11

Tutorials
• 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
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 !!
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
15

Tutorial 4
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 !!
16

Tutorial 5
Graphical nature of functions
• Objective
– Plot functions
Generate equi-spaced data (data range)
 Generate splines
– Smooth polynomial
Plot the generated spline to know its nature
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
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
0 0t 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
0 0t 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
0 0t t u u 
2
0 1 2f (x) a a x a x  
21

Tutorial 10
! Obtain data in Smart Way !
• Objective
– Use of simple GUI function to obtain data
Avoids error previously encountered in Tutorial 4 !
22

Tutorial 11
Write output data into a file
• Objective
– Use file I/O commands and write result into a file
 Water tank of known dimensions (B X W X H) at elevated position
Z from ground level
 Fluid of known density ( r )
Compute Total and specific potential energy
Tutorial11-File-operation.sce
tank tank
t
V BW H m V
U
U mg Z U
m
  r
 
23

Tutorial 12
Sum on N numbers
• Objective
– Use looping statement – For loop
 Determine the sum of N numbers
Tutorial12-File-operation.sce
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
25

Gratitude
• CAPE-2015 and IIChE Student Chapter
– For this wonderful opportunity
• PR Team for their registration drive !!
• Technical and Infra support team
• Audience
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.
27

Scilab: Computing Tool For Engineers

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