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Using MATLAB

Using MATLAB. Oct. 2, 2008. About Matlab. Origins are in linear algebra Much functionality added later Runs on all platforms Many toolboxes exist. The User Interface. You can use Matlab interactively Just type commands and view results Difficulty is saving session

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Using MATLAB

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  1. Using MATLAB Oct. 2, 2008

  2. About Matlab • Origins are in linear algebra • Much functionality added later • Runs on all platforms • Many toolboxes exist

  3. The User Interface • You can use Matlab interactively • Just type commands and view results • Difficulty is saving session • To use scripts (m-files) • To use the built-in editor

  4. The Approach • Put commands into m-file • Run from main Matlab window • Edit m-file • Rerun • Repeat to perfection • Save and turn in m-file

  5. Variables • A=5 • B=3 • C=A+B • C=C+3

  6. Vectors and Matrices • Think of vectors as lists • Think of matrices as arrays (lists of lists) • V1=[0 1 2 3 4] • V2=0:4 • M1=[1 0 1; 0 1 0; 0 0 1] • M2=ones(3)

  7. Accessing elements • You can pick out individual components of vectors and matrices • V1(3) • M1(2,3) • M1(:,2) • M1(1,:)

  8. Vector Math • Try this: • V=0:5 • Z=V*V • To square each element: • Z=V.*V • Also ./ and .^

  9. Plotting • Make vectors for x and y axis and the plot them x=0:0.1:10 y=sin(x) plot(x,y) plot(x,y,x,y,’o’)

  10. Functions • exp, log, log10, sqrt • sin, cos, tan, asin, acos, atan • max, min, mean, median, sum, prod, sort

  11. Flow Control if x<10 then x=x+1 else x=x^2 end

  12. Flow Control (cont) for i=1:10 z=z*I end

  13. User-Defined Functions • Suppose we want to plot: sin(3*x)+sin(3.1*x) • Create user-defined function function r=f(x) r= sin(3*x)+sin(3.1*x) • Save as f.m

  14. Conclusions • This should get you started with Matlab • help help+command

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