L6 10 30 2003

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Information about L6 10 30 2003

Published on November 5, 2007

Author: miloung



Introduction to MATLAB:  Introduction to MATLAB Northeastern University: College of Computer and Information Science Co-op Preparation University (CPU) 10/29/2003 Overview for 10/30/2003:  Overview for 10/30/2003 Brief review of topics covered in last session (10/29/2003) MATLAB Functions Looping! Optimization Review of topics covered thus far Review for 10/29/2003:  Review for 10/29/2003 File Output MATLAB Scripts and Functions High Level File Output:  High Level File Output Some of the input commands have corresponding high-level output commands csvwrite dlmwrite csvwrite:  csvwrite Write a matrix to a comma-seperated value file Syntax: csvwrite('filename',M) csvwrite('filename',M,row,col) Ex. csvwrite(‘blah.csv’,a); dlmwrite:  dlmwrite Writes a matrix to a delimited file (using the delimiter you specify) Syntax: dlmwrite(filename,M,delimiter) dlmwrite(filename,M,delimiter,row,col) Ex. dlmwrite(‘blah.txt’,a,’:’); Low-Level file I/O:  Low-Level file I/O fopen fclose fprintf fgetl / fgets fopen:  fopen Opens a file and returns the handle to the file object File_ID = fopen(‘blah.txt’) Capturing the file handle is necessary to write or read to/from the file fclose:  fclose Closes a file associated with a specific file identification handle Ex. fclose(File_ID); Ex. fclose(‘all’); fprintf:  fprintf Multi-use: can output to a file or a screen Ex. fprintf(fid,'%6.2f %12.8f\n',y); %6.2f means a floating point with 6 leading decimals and 2 trailing Specifying 1 instead of fid will output to the screen fgetl / fgets:  fgetl / fgets Get line and get string, respectively. Fgetl will get you a line without the newline character at the end, while fgets will preserve the newline character (\n). Syntax: Line = fgetl(File_ID); Line = fgets(File_ID); Programming in MATLAB:  Programming in MATLAB Two types of files: Scripts Functions MATLAB Scripts:  MATLAB Scripts Scripts are MATLAB commands stored in text files. When you type the name of the script file at the MATLAB prompt the commands in the script file are executed as if you had typed them in from the keyboard. Scripts end with the extension .m Referred to as M-Files MATLAB Functions:  MATLAB Functions Functions are similar to scripts Functions may take arguments Functions may return one or more values MATLAB Functions, con’t: 2:  MATLAB Functions, con’t: 2 function [output] = function_name(input_arguments) The above is a function header and should be the first non-comment line in the function file Comments may be placed above the function header MATLAB Functions, con’t: 3:  MATLAB Functions, con’t: 3 Example function function [output] = square(input) output = input*input; Body of functions can contain code just like scripts could Looping!:  Looping! Scripts and functions also allow the ability to loop using conventional for and while loops. Note that the interpreter also lets you do it, it is simply less easy to grasp For Loops:  For Loops Common to other programming languages for variable = expression statement ... statement end For Loops, con’t: 2:  For Loops, con’t: 2 Example: (taken from MATLAB help) a = zeros(k,k) % Preallocate matrix for m = 1:k for n = 1:k a(m,n) = 1/(m+n -1); end end For Loops, con’t: 3:  For Loops, con’t: 3 The looping variable is defined in much the same way that we defined arrays/vectors. Ex. m = 1:k Or m = 1:10 For Loops, con’t: 4:  For Loops, con’t: 4 Loops are shown to end by the keyword “end” Curly braces are not present to subdivide packets of code Make use of adequate white-space and tabbing to improve code readability While Loops:  While Loops Similar to while loops in other languages while expression statement … end While Loops, con’t: 2:  While Loops, con’t: 2 Ex. (taken from help while) while (1+eps) > 1 eps = eps/2; end While Loops, con’t: 3:  While Loops, con’t: 3 Same notes apply to while loops. Code is separated by the keyword “end” Looping conclusion:  Looping conclusion Some other aspects of looping exist Use help while and help for to see them MATLAB Code Optimization:  MATLAB Code Optimization Two ways to optimize MATLAB code Vectorize code Preallocate matrices Information contained here: Review:  Review Week 1: MATLAB GUI Simple Commands Declaring Variables Simple functions Week 2: Plotting File Input File Output MATLAB GUI:  MATLAB GUI Launch Pad / Toolbox Workspace Current Directory Command History Command Window Simple Commands:  Simple Commands who whos save clear load Declaring a variable in MATLAB:  Declaring a variable in MATLAB Not necessary to specify a type. (Such as int or float) Several kinds of variables: Vector Matrix Structure Cell array Declaring a variable, con’t: 2:  Declaring a variable, con’t: 2 For an integer or floating point number: simply set a variable name equal to some character Ex. A = 5; Or A = 5 Sample MATLAB functions:  Sample MATLAB functions Min Max Median Mean Sum Diff Plotting:  Plotting Several types of plots available Plot Polar Bar Hist Plot() con’t: 3 – Color options:  Plot() con’t: 3 – Color options Color options: Yellow - ‘y’ Magenta - ‘m’ Cyan - ‘c’ Red - ‘r’ Green - ‘g’ Blue - ‘b’ White - ‘w’ Black - ‘k’ Example: plot(temp, ‘y’); Plot() con’t: 4 – Line options:  Plot() con’t: 4 – Line options Line styles: - solid line (default) -- dashed line : dotted line -. dash-dot line High-Level File I/O:  High-Level File I/O I/O = input/output 3 important commands for input csvread dlmread textread Look Ahead:  Look Ahead Next week: Review of any topics requested Profiling your code for speed Each day will have a separate part of the project End:  End Happy Halloween!

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