22. Plotting Data

# 22. Plotting Data - ENGR 101 Section 100 Fall 10...

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ENGR 101, Section 100, Fall 10 M. Wellman 1 Visualizing Data ENGR 101, Lecture 22: 1 Dec 10 Announcements Project 7 due tonight : Wed 1 Dec Project 8 out tonight, due Mon 13 Dec No extensions possible Dealing with MATLAB license contention

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ENGR 101, Section 100, Fall 10 M. Wellman 2 MATLAB Type Conversions Sometimes automatic ( coercion ): 'a' + 3 100 'a' + 'b' 195 90 + true 91 ~[40 0 -3] [0 1 0] (logicals) Can also use explicit conversion ( cast ) functions: logical([40 0]) [1 0] (logicals) char(98) b double('b') 98 Array Element Types In an array, all elements must be same type Element type determined on array initialization v = 1:5 a vector of numbers w = 'abcde' a vector of characters Assigning different types to elements will cause a conversion v(3) = 'x' v = [ 1 2 120 4 5 ] w(3) = 120 w = 'abxde' To assign an element to chosen type, initialize that way or perform explicit conversion v(numElts) = 'x'; v = ones(1,numElts); v = char(v); v = char('x' * ones(1,numElts));
ENGR 101, Section 100, Fall 10 M. Wellman 3 Plotting Data in MATLAB plot : general plotting function Many forms, depending on number and content of arguments Generates a new figure (e.g., for a graph) in the Figure window Opens new window if necessary Basic form: plot ( x , y ) x is a vector of x values y is a vector of y values x = 1:0.1:10; y = x .^ 2 – 10 * x + 15; plot(x, y); Plot draws corresponding (x,y) points on graph, connecting adjacent points in vectors by lines Adding Information to a Figure title( title_string ) Adds specified title to figure (or changes existing title) xlabel( label_string ) ylabel( label_string )

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