Lecture2 - MATLAB Lecture 2 1 Introduction Today we create...

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MATLAB Lecture 2 1. Introduction Today we create 2-dimensional and 3-dimensional plots. Once again, you should create a new directory for today’s exercises. 2. 2-D Graphics 2.1. The Plot Command. We have already seen the plot command, which is the most common command for plotting 2-dimensional data. This command plots sets of data arrays, connecting the points with straight lines. Example 2.1. x=linspace(0,2*pi,30); y=sin(x); plot(x,y) This example creates 30 data points 0 x 2 π which are used as the horizontal axis of the plot. Next we create a vector y containing the sine of the data points in x . The plot command opens a graphics window, scales the axes to fit the data, and then connect adjacent ponts with a straight line. It also adds a numerical scale and tick marks to both axes automatically. We can easily plot two data sets at once: z=cos(x); plot(x,y,x,z) 1
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This example draws both sin(x) and cos(x) versus x on the same plot. Note that plot automatically draws the second curve using a different color. Additional curves may be plotted by supplying additional pairs of arguments to plot. If one of the arguments is a matrix and the other is a vector, then the plot command plots each row of the matrix versus the vector. W=[y;z] % note that you must use ; to make this a matrix plot(x,W) title(’plot(x,W)’) 2.2. Linestyles, Markers and Colors.
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