What is MATLAB? It is a high-level programming language. for numerical computations for symbolic computations for scientific visualizations
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2 What is MATLAB? It stands for MATrix LABoratory It is developed by The Mathworks, Inc ( It is an interactive, integrated, environment for numerical computations for symbolic computations for scientific visualizations It is a high-level programming language
3 Characteristics of MATLAB Programming language based (principally) on matrices. Slow (compared with fortran or C) because it is an interpreted language,i.e.not pre-compiled. Avoid for loops; instead use vector form whenever possible. Automatic memory management, i.e., you don't have to declare arrays in advance. Intuitive, easy to use. Shorter program development time than traditional programming languages such as Fortran and C. Can be converted into C code via MATLAB compiler for better efficiency. Many application-specific toolboxes available.
4 Start menu Matlab MATLAB שורת הפקוד ה << >> date
5 Getting Help >> help date >> helpwin date helpwin gives you the same information as help, but in a different window.
6 Getting Help >> doc date >> lookfor date % search for keywords that best describe the function >> Ctrl+C % stop Matlab from running >> clc % clear screen
7 Special characters >> % default command prompt % % comment - MATLAB simply ignores anything to the right of this sign (till the end of the line). >> % my comment ; % semicolon at the end of the line will prevent MATLAB from echoing the information you type on the screen. >> a=20 >> B=20;
8 Creating Variables Matlab as a calculator: >>2+5 >>7*10+8 >>5^2 ans - "answer", used in MATLAB as the default variable.
9 Defining Your Own Variables When Matlab comes across a new variable name it automatically creates it. Begins with a LETTER, e.g., A2z. Can be a mix of letters, digits, and underscores (e.g., vector_a, but not vector-a) Not longer than 31 characters. No spaces Different mixes of capital and small letters = different variables. For example: "A_VaRIAbLe", "a_variable", "A_VARIABLE", and "A_variablE >> String='this is a string'
10 Listing & Clearing Variables >> a=10 >> b = 20 >> the_average = (a + b ) / 2 >> whos >> clear %clear variables from memory
11 Creating vectors Column separator: space/coma (,) Row separator: Semicolon (;) Creating sequences: From : jump: till
12 Creating Matrices Matrices must be rectangular. Creating random matrices: 2-by-4 random matrix (2 rows and 4 columns).
13 Creating Matrices You can combine existing vectors as matrix elements: You can combine existing matrices as matrix elements:
14 Indexing Into a Matrix >> mat_from_mat(8) >> mat_from_mat(4,2)=0 >> mat_from_mat The row number is first, followed by the column number.
15 Linear Algebra Operations
16 Matrix Multiplication Inner dimensions must be equal Dimension of resulting matrix = outermost dimensions of multiplied matrices Resulting elements = dot product of the rows of the 1st matrix with the columns of the 2nd matrix
17 Vector Multiplication Type the following: >>a=[2 3] >>b=[3 2] >>a*b >>a.*b >>a.*b' >>a*b'
18 Example: Solving Equations Solve this set of simultaneous equations
19 Array Operations
20 Boolean Operators & Indexing
21 String Arrays Created using single quote delimiter (') Each character is a separate matrix element (16 bits of memory per character) Indexing same as for numeric arrays
22 String Array Concatenation
23 Working with String Arrays
24 Line Plots in Two Dimensions Plot (x,y) makes a two-dimensional line plot for each point in X and its corresponding point in Y: (X(1),Y(1)), (X(2),Y(2)), (X(3),Y(3)), etc., and then connect all these points together with line. Example: >> x=1:1:5; >>y=[ ]; >> plot (x,y); >> xlabel ('label for x-axis') >> ylabel ('label for y-axis') >> title ('title')
25 Multiple Plots Check the following: x_points = [-10 :.05 : 10]; plot(x_points, exp(x_points)); grid on hold on plot(x_points, exp(.95.* x_points), 'm'); plot(x_points, exp(.85.* x_points), 'g'); plot(x_points, exp(.75.* x_points), 'p'); xlabel('x-axis'); ylabel('y-axis'); title('comparing Exponential Functions'); legend ('1', '2', '3', '4') y-axis 2.5 x Comparing Exponential Functions x-axis
26 Subplots multiple plots in the same window, each with their own axes. Subplot (M,N,P) M rows N - columns P number of subplot in the figure Subplot (2,2,1)
27 More about figures Figure % Open a new figure without closing old figures Figure (i) % Open the i-th figure Close all % close all open figures axis ([xmin xmax ymin ymax]) % sets scaling for the x- and y-axes on the current plot.
28 Special Graph Annotations (TeX)
29 Plot Editor Toolbar
30 Exercise Create the following: Merav's graph sin(x) log(x) 1 y x x = (1, 1.05, 1.1, ) Y=sin(x) Z=log(x) Put your name in the title Hint: check the doc linespec.
31 Solution >>x=1:0.05:5; >>y=sin(x); >>z=log(x); >> hold on >> plot (x,y,'-.r*') >> plot (x,z,'-.go') >> hold off >> title ('Merav''s graph'); >> xlabel ('x') >> ylabel ('y') >> legend ('sin(x)', 'log(x)');
32 More exercise Make a 3 three-dimensional graph of (x,y,z) use Matlab help. Make two separate 2-D graphs, with separate axis, in the same window: y vs. x, and z vs. x. 1 sin(x) 1.8 log(x) 3D graph y=sin(x) z z x x y x 3 4 5
33 Solution 3-D graph: >> plot3(x,y,z) >> grid >> xlabel ('x') >> ylabel('y') >> zlabel('z') >> title ('3D graph') Subplots >> subplot (1,2,1); >> plot(x,y); >> title ('sin(x)'); >> xlabel('x'); >> ylabel('y=sin(x)'); >> grid; >> subplot (1,2,2); >> plot(x,z); >> xlabel('x'); >> title ('log(x)'); >> grid; >> ylabel ('z');
34 Surface Mesh plots 1) Generate a grid of points in the xy-plane using the meshgrid command. 2) Evaluate the three-dimensional function at these points. 3) Create the surface plot with the mesh command. Meshgrid - returns all possible combinations of (x,y) points, where x is taken from X and y is taken from Y, in the form of two matrices. you will see in the generated surface mesh plot a bunch of rectangles, of width and length equal to the regular spacing values for X and Y, and the height of the corners of the rectangles will be equal to the value of the function at the rectangles' corner points)
35 1. >> x_points = [-10 : 1 : 10]; >> y_points = [-10 : 4 : 10]; >> [X, Y] = meshgrid(x_points,y_points); 2. >> Z = X.^2 + Y.^2; 3. >> mesh(x,y,z); >> xlabel('x-axis'); >> ylabel('y-axis'); >> zlabel('z-axis'); z-axis X: -9 Y: -10 Z: y-axis x-axis
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