TAILIEUCHUNG - Lecture note Data visualization - Chapter 24

The main contents of the chapter consist of the following: Plots with more than one line, plots of complex arrays, line, color and mark style, axis scaling and annotating plots, subplots, polar plots, logarithmic plots, bar graphs and pie charts, histograms, X-Y graphs with two Y-axes. | Lecture note Data visualization - Chapter 24 Lecture 24 Recap Plots with More than one Line Plots of Complex Arrays Line Color and Mark Style Axis Scaling and Annotating Plots Subplots Polar Plots Logarithmic Plots Bar Graphs and Pie Charts Function Plots Three Dimensional Line Plots The plot3 function is similar to the plot function except that it accepts data in three dimensions Instead of just providing x and y vectors the user must also provide a z vector These ordered triples are then plotted in three space and connected with straight lines For example clear clc x linspace 0 10 pi 1000 y cos x Surface Plots Surface plots allow to represent data as a surface Two types of surface plots Mesh plots Surf plots Mesh Plots There are several ways to use mesh plots They can be used to good effect with a single two dimensional mxn matrix In this application the value in the matrix represents the z value in the plot The x and y values are based on the matrix dimensions Take for example the following very simple matrix z 1 2 3 4 5 6 7 8 9 10 2 4 6 8 10 12 14 16 18 20 3 4 5 6 7 8 9 10 11 12 Explanation of Graph The graph is a mesh created by connecting the points defined in z into a rectilinear grid Notice that the x axis goes from 0 to 10 and y goes from 1 to 3 The matrix index numbers were used for the axis values Mesh Plots Continued . The mesh function can also be used with three arguments mesh x y z In this case x is a list of x coordinates y is a list of y coordinates and z is a list of z coordinates. x linspace 1 50 10 y linspace 500 1000 3 z 1 2 3 4 5 6 7 8 9 10 2 4 6 8 10 12 14 16 18 20 3 4 5 6 7 8 9 10 11 12 Surf Plots Surf plots are similar to mesh plots but surf creates a three dimensional colored surface instead of a mesh The colors vary with the value of z The surf command takes the same input as mesh either a single input For example surf z in which case it uses the row and column indices as x and y coordinates or three matrices The command surf x y z .

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