Download presentation

Presentation is loading. Please wait.

Published byNeil Cortner Modified over 2 years ago

2
Programming Environment S. Awad, Ph.D. M. Corless, M.S.E.E. E.C.E. Department University of Michigan-Dearborn Introduction to Matlab: Cells and Structures

3
MATLAB Programming: U of M-Dearborn ECE Department Introduction to MATLAB and its Toolboxes Cells and Structures 2 Cell and Structure Topics n Cell Arrays Cell Arrays n Preallocating Cells Preallocating Cells n Structures Structures n Structure Example: dir Structure Example: dir

4
MATLAB Programming: U of M-Dearborn ECE Department Introduction to MATLAB and its Toolboxes Cells and Structures 3 Cell Arrays n Cells are containers that hold other Matlab Arrays n One Cell Array may contain u A Real Matrix u An Array of Strings u Vector of complex values u A Cell of other Matlab Arrays n Cells may be High-Dimensional (more than just 2D)

5
MATLAB Programming: U of M-Dearborn ECE Department Introduction to MATLAB and its Toolboxes Cells and Structures 4 Cell Array Example n 2 Row by 3 Column Array of Elements

6
MATLAB Programming: U of M-Dearborn ECE Department Introduction to MATLAB and its Toolboxes Cells and Structures 5 Creating a Cell Array n Cell Indexing » MyCell(1,1) = {[1 2 3; 2 3 4]}; » MyCell(1,2) = {1:0.2:2}; » MyCell(2,1) = {4+7i}; » MyCell(2,2) = {['The '; 'LAST';'cell']}; n Content Indexing » MyCell{1,1} = [1 2 3; 2 3 4]; » MyCell{1,2} = 1:0.2:2; » MyCell{2,1} = 4+7i; » MyCell{2,2} = ['The '; 'LAST';'cell'];

7
MATLAB Programming: U of M-Dearborn ECE Department Introduction to MATLAB and its Toolboxes Cells and Structures 6 » MyCell ={ [1 2 3; 2 3 4], 1:0.2:2; 4+7i, ['The '; 'LAST';'cell']} Cell = [2x3 double] [1x6 double] [4.0000+ 7.0000i] [3x4 char ] » MyCell(1,1) ans = [2x3 double] » MyCell{1,2} ans = 1.0000 1.2000 1.4000 1.6000 1.8000 2.0000 Cell Example To View Type or 1D Contents To View Contents

8
MATLAB Programming: U of M-Dearborn ECE Department Introduction to MATLAB and its Toolboxes Cells and Structures 7 » B=cell(3,2) B = [] [] » B(2,1)={1:0.01:2} B = [] [] [1x101 double] [] [] [] Preallocating Cells To preallocate a Cell Array, use cell command Assigning a cell displays properties of entire cell

9
MATLAB Programming: U of M-Dearborn ECE Department Introduction to MATLAB and its Toolboxes Cells and Structures 8 Structures n Structures are Matlab arrays with names “Data Containers” called fields n A structure may hold any type of Matlab data n Structure Arrays are multidimensional arrays of structures (1D, 2D, 3D, …) n A single structure is a 1x1 Structure Array

10
MATLAB Programming: U of M-Dearborn ECE Department Introduction to MATLAB and its Toolboxes Cells and Structures 9 » turtle.name = 'Ted'; » turtle.type = 'aquatic'; » turtle.age = 10; » turtle.color = {'Brown Shell','Red Lines'} turtle = name: 'Ted' type: 'aquatic’ age: 10 color: {1x2 cell} Building Structures n Matlab Structures do not require definition like C structures do n Simply type the structure name and assigned field Stored in Order of Assignment

11
MATLAB Programming: U of M-Dearborn ECE Department Introduction to MATLAB and its Toolboxes Cells and Structures 10 Adding Structures to Array » turtle(2).name ='OneShot'; » turtle(2).type ='land'; » turtle(2).age = 1; » turtle(2).color ={'Sandy brown'} Not same size as ' aquatic ' Displays size and field names Any Cell turtle = 1x2 struct array with fields: name type age color

12
MATLAB Programming: U of M-Dearborn ECE Department Introduction to MATLAB and its Toolboxes Cells and Structures 11 Dir Command Example » D=dir('*.m') Find All files with.m extension D = name: 'comparescores.m’ Only one is found so date: '15-Jul-1998 11:43:42’ all fields are shown bytes: 4677 isdir: 0 » D2=dir('*.txt') Find All files with.txt extension D2 = 4x1 struct array with fields: Many files are found name so only field names date are shown bytes isdir

13
MATLAB Programming: U of M-Dearborn ECE Department Introduction to MATLAB and its Toolboxes Cells and Structures 12 Accessing Structure Data D=dir('*.TXT');% List of all text Files FileNames = Result of Code u1_040898_1601.txt u1_040898_1602.txt u1_041398_1428.txt u1_041398_1429.txt maxFiles = size(D,1);% Number of retrieved text files for I=1:maxFiles,% For all files in the directory FileNames(I,1:size(D(I).name,2))= D(I).name; end FileNames is created and updated as Necessary

Similar presentations

OK

CIS 101: Computer Programming and Problem Solving Lecture 2 Usman Roshan Department of Computer Science NJIT.

CIS 101: Computer Programming and Problem Solving Lecture 2 Usman Roshan Department of Computer Science NJIT.

© 2017 SlidePlayer.com Inc.

All rights reserved.

Ads by Google

Ppt on recycling of waste oil Ppt on 9/11 conspiracy Ppt on pricing policy Ppt on current account convertibility How to save ppt on ipad 2 Ppt on juvenile rheumatoid arthritis Free ppt on moving coil galvanometer diagram Ppt on network layer in computer networks Ppt on fire extinguisher types for servers Ppt on pi in maths what is the factor