Introduccion a scilab

Sww.scilab.org

INTRODUCTION TO SCILAB

Consortium sCilab
Domaine de Voluceau - Rocquencourt - B.P. 105 - 78153 Le Chesnay Cedex France

! #

"

November 2010
Abstract In this document, we make an overview of Scilab features so that we can get familiar with this environment. The goal is to present the core of skills necessary to start with Scilab. In the first part, we present howto get and install this software on our computer. We also present how to get some help with the provided in-line documentation and also thanks to web resources and forums. In the remaining sections, we present the Scilab language, especially its structured programming features. We present an important feature of Scilab, that is the management of real matrices and overview the linear algebralibrary. The definition of functions and the elementary management of input and output variables is presented. We present Scilab’s graphical features and show how to create a 2D plot, how to configure the title and the legend and how to export that plot into a vectorial or bitmap format.

Contents
1 Overview 1.1 Introduction . . . . . . . . . . . . . . . . . . 1.2 Overview of Scilab . . . . . . . . .. . . . . 1.3 How to get and install Scilab . . . . . . . . . 1.3.1 Installing Scilab under Windows . . . 1.3.2 Installing Scilab under Linux . . . . 1.3.3 Installing Scilab under Mac OS . . . 1.4 How to get help . . . . . . . . . . . . . . . . 1.5 Mailing lists, wiki and bug reports . . . . . . 1.6 Getting help from Scilab demonstrations and 1.7 Exercises . . . . . . . . . . . . . . . . . . . .2 Getting started 2.1 The console . . . 2.2 The editor . . . . 2.3 Docking . . . . . 2.4 Using exec . . . 2.5 Batch processing 2.6 Exercises . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . macros . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . 5 . 5 . 5 . 6 . 7 . 7 . 8 . 8 . 9 . 10 . 11 11 11 12 14 16 17 19

. . . . . .

. . . . . .

. . . . . .

. . . . . .

. . . . . .

. . . . . .

. . . . . .

. . . . . .

. . . . . .

. . . . . .

. . . . . .

. . . . . .

. . . . . .

. . . . . .

. . . . . .

. . . . . .

. . . . . .

. . . . . .

. . . . . .

. . . . . .

. . . . . .

. . . .. .

. . . . . .

. . . . . .

. . . . . .

. . . . . .

. . . . . .

. . . . . .

. . . . . .

1

3 Basic elements of the language 3.1 Creating real variables . . . . . . . . . 3.2 Variable names . . . . . . . . . . . . . 3.3 Comments and continuation lines . . . 3.4 Elementary mathematical functions . . 3.5 Pre-defined mathematical variables . . 3.6 Booleans . . . . . . . . .. . . . . . . . 3.7 Complex numbers . . . . . . . . . . . . 3.8 Integers . . . . . . . . . . . . . . . . . 3.8.1 Overview of integers . . . . . . 3.8.2 Conversions between integers . 3.8.3 Circular integers and portability 3.9 Floating point integers . . . . . . . . . 3.10 The ans variable . . . . . . . . . . . . 3.11 Strings . . . . . . . . . . . . . . . . . . 3.12 Dynamic type of variables . .. . . . . 3.13 Exercises . . . . . . . . . . . . . . . . . 4 Matrices 4.1 Overview . . . . . . . . . . . . . . . . 4.2 Create a matrix of real values . . . . . 4.3 The empty matrix [] . . . . . . . . . . 4.4 Query matrices . . . . . . . . . . . . . 4.5 Accessing the elements of a matrix . . 4.6 The colon ”:” operator . . . . . . . . . 4.7 The eye matrix . . . . . . . . . . . . . 4.8 Matrices aredynamic . . . . . . . . . . 4.9 The dollar ”$” operator . . . . . . . . . 4.10 Low-level operations . . . . . . . . . . 4.11 Elementwise operations . . . . . . . . . 4.12 Conjugate transpose and non-conjugate 4.13 Multiplication of two vectors . . . . . . 4.14 Comparing two real matrices . . . . . . 4.15 Issues with floating point integers . . . 4.16 More on elementary functions . . . . . 4.17...