2D Plots 2 ENGR 1181 MATLAB 13

Plotting in the Real World 2D plots generated by MATLAB can be used in a variety of fields, including the one shown here, which is showing life expectancy vs. literacy rates vs. population in various continents.

Today's Learning Objectives  After today’s class, students will be able to: Create other 2D graphing options in MATLAB (e.g., log, bar, subplot, fplot). Select the proper opportunities to utilize aforementioned 2D graphing options.

The fplot() Command >> fplot('function', [limits])  The fplot() command lets you plot a function instead of using vectors of x and y values  Only one variable can be referenced in the function  Function is entered as a string  Limits are entered as a vector

The fplot Command Plot the function y = x^3 + 2x^2 -5 for -3<x<3: >> fplot('x^3 + 2*x^2 -5', [-3,3]) Remember that only one variable can be in the fplot() command and that the function is entered as a string

Polar Plots >> polar(theta, r)  The polar command plots functions with coordinates r and Ɵ.  r and Ɵ must be equal length vectors, and Ɵ is in radians  Use 'hold on, hold off' to plot multiple curves.

Subplots >> subplot(rows, columns, plot #)  Use before typing the plot command  Specifies the location of the subsequent plot  Ex: subplot(2,2,3) plot(x,y3) title('Subplot 3: sin(4x)')

Important Takeaways  The fplot() command can be used to plot functions  Polar plots can also be generated using the polar() command  Multiple plots can be organized in the same figure with the subplot() command

Preview of Next Class  Functions I What is a function? Introduce basic structure of MATLAB functions Provide examples of functions

What’s Next?  Review today’s Quiz #13  Open the in-class activity from the EEIC website and we will go through it together.  Then, start working on MAT-13 homework.  Prepare for the next class by reading about MATLAB Functions 1.