tailieunhanh - Digital Signal Processing : Introduction to MATLAB

Command window: main window characterized by ‘’ command prompt. Edit window: where programs are written and saved as ‘Mfiles’. Graphics window: shows figures, alternately known as Figure are assigned numerical values by typing the expression directly a = 1+2 press enter a = 3 a = 1+2; suppresses the output | Digital Signal Processing : Introduction to MATLAB Ms. T. Samanta Lecturer Department of Information Technology BEIT, 6th Semester Books: “Getting Started with MATLAB” - Rudra Pratap “Digital Signal Processing ” - Sanjit K. Mitra. “Digital Signal Processing-A Practitioner’s Approach” - Kaluri V. Rangarao - Ranjan K. Mallik BEIT, 6th Semester Introduction MATLAB -> MATrix LABoratory Built-in Functions -Computations -Graphics -External Interface -Optional Toolbox for Signal Processing, System analysis, Image Processing BEIT, 6th Semester How many windows? BEIT, 6th Semester MATLAB Windows Command window: main window characterized by ‘>>’ command prompt. Edit window: where programs are written and saved as ‘M-files’. Graphics window: shows figures, alternately known as Figure window. BEIT, 6th Semester Command Window Figure Window Edit Window BEIT, 6th Semester Matlab Basics BEIT, 6th Semester MATLAB Basics: Variables Variables: -Variables are assigned numerical values by typing the . | Digital Signal Processing : Introduction to MATLAB Ms. T. Samanta Lecturer Department of Information Technology BEIT, 6th Semester Books: “Getting Started with MATLAB” - Rudra Pratap “Digital Signal Processing ” - Sanjit K. Mitra. “Digital Signal Processing-A Practitioner’s Approach” - Kaluri V. Rangarao - Ranjan K. Mallik BEIT, 6th Semester Introduction MATLAB -> MATrix LABoratory Built-in Functions -Computations -Graphics -External Interface -Optional Toolbox for Signal Processing, System analysis, Image Processing BEIT, 6th Semester How many windows? BEIT, 6th Semester MATLAB Windows Command window: main window characterized by ‘>>’ command prompt. Edit window: where programs are written and saved as ‘M-files’. Graphics window: shows figures, alternately known as Figure window. BEIT, 6th Semester Command Window Figure Window Edit Window BEIT, 6th Semester Matlab Basics BEIT, 6th Semester MATLAB Basics: Variables Variables: -Variables are assigned numerical values by typing the expression directly >> a = 1+2 press enter >> a = 3 >> a = 1+2; suppresses the output BEIT, 6th Semester Variables several predefined variables i sqrt(-1) j sqrt(-1) pi . >> y= 2*(1+4*j) >> y= + BEIT, 6th Semester Variables Global Variables Local Variables BEIT, 6th Semester MATLAB Basics: Arithmetic operators: + addition, - subtraction, * multiplication, /division, ^ power operator, ' transpose BEIT, 6th Semester Matrices Matrices : Basic building block Elements are entered row-wise >> v = [1 3 5 7] creates a 1x4 vector >> M = [1 2 4; 3 6 8] creates a 2x3 matrix >> M(i,j) => accesses the element of ith row and jth column BEIT, 6th Semester Basics Matrices Special Matrices null matrix: M = []; nxm matrix of zeros: M = zeros(n,m); nxm matrix of ones: M = ones(n,m); nxn identity matrix: M = eye(n); --Try these Matrices [eye(2);zeros(2)],[eye(2);zeros(3)], [eye(2),ones(2,3)] BEIT, 6th Semester Matrix Operations Matrix operations: A+B is valid if A and B are of same size