INTRODUCTION TO MATLAB
SOFTWARE
Graphics and Plotting in MATLAB
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MATLAB graphics Fundamentals
Graphics and Plotting in MATLAB
• Basic Plotting
– plot, title, xlabel, grid, legend, hold, axis
• Editing Plots
– Property Editor
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MATLAB graphics Fundamentals
Graphics and Plotting in MATLAB
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MATLAB graphics Fundamentals
Practice
>> x = [0:2:18];
>> y = [0, 0.33, 4.13, 6.29, 6.85, 11.19, 13.19, 13.96, 16.33,
18.17];
>> plot(x,y)
>> xlabel('Time, sec')
>> ylabel('Distance, ft')
>> grid on
>> title('Laboratory Experiment 1')
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MATLAB graphics Fundamentals
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MATLAB graphics Fundamentals
2-D Plotting
Syntax:
plot(x1, y1, 'clm1', x2, y2, 'clm2', ...)
Example:
x=[0:0.1:2*pi];
y=sin(x);
z=cos(x);
plot(x,y,x,z,'linewidth',2)
title('Sample Plot','fontsize',14);
xlabel('X values','fontsize',14);
ylabel('Y values','fontsize',14);
legend('Y data','Z data')
grid on
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MATLAB graphics Fundamentals
Sample Plot
Title
Ylabel
Grid
Legend
Xlabel
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MATLAB graphics Fundamentals
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MATLAB graphics Fundamentals
Displaying Multiple Plots
• Nomenclature:
– Figure window – the window in which MATLAB displays plots
– Plot – a region of a window in which a curve (or surface) is displayed
• Three typical ways to display multiple curves in MATLAB (other combinations
are possible…)
– One figure contains one plot that contains multiple curves
• Requires the use of the command “hold” (see MATLAB help)
– One figure contains multiple plots, each plot containing one curve
• Requires the use of the command “subplot”
– Multiple figures, each containing one or more plots, each containing one or more curves
• Requires the use of the command “figure” and possibly “subplot”
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MATLAB graphics Fundamentals
Subplots: (One figure contains multiple plots, each plot containing one curve
• Requires the use of the command “subplot”)
Syntax:
subplot(rows,cols,index)
»subplot(2,2,1);
» …
»subplot(2,2,2)
» ...
»subplot(2,2,3)
» ...
»subplot(2,2,4)
» ...
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MATLAB graphics Fundamentals
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MATLAB graphics Fundamentals
The “figure” Command
• Use if you want to have several figures open for plotting
• The command by itself creates a new figure window and returns its handle
>> figure
• If you have 20 figures open and want to make figure 9 the default one (this is where
the next plot command will display a curve) use
>> figure(9)
>> plot(…)
• Use the command close(9) if you want to close figure 9 in case you don’t need it
anymore
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MATLAB graphics Fundamentals
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MATLAB graphics Fundamentals
Surface Plot
x = 0:0.1:2;
y = 0:0.1:2;
[xx, yy] = meshgrid(x,y);
zz=sin(xx.^2+yy.^2);
surf(xx,yy,zz)
xlabel('X axes')
ylabel('Y axes')
Individual Practice!!!!
Read additional material and attempt to practice
Surface Plot
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MATLAB graphics Fundamentals
3-D Surface Plotting
contourf-colorbar-plot3-waterfall-contour3-mesh-surf
Individual Practice!!!!
Read additional
material and
attempt to
practice
3-D Surface
Plotting
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MATLAB graphics Fundamentals
Specialized Plotting Routines
bar-bar3h-hist-area-pie3-rose
Individual Practice!!!!
Read additional
material and
attempt to
practice
Specialized
Plotting
Routines
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MATLAB symbolic Math’s
MATLAB Symbolic Mathematics ፡
Symbolic mathematics defines doing mathematics on symbols (not numbers!). For example, a+a
is 2a. The symbolic math function is in the Symbolic Math Toolbox in MATLAB.
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INTRODUCTION TO MATLAB
SOFTWARE
MATLAB-Simulink
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MATLAB-SIMULINK
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Creating Script
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