The MATLAB code shown below generates a plot of the line =3²+2x+5 in a new figure window. Copy the code below to a script m-file and add code to it to wait for the user to mouse-click somewhere within the figure axes. After clicking, display a new title on the plot which indicates whether they clicked above the line, or below the line. You will need to use the waitforbuttonpress and get(gca,'CurrentPoint') expressions.

The mouse clicks values are stored as a 2x3 array. Evaluate the equation of your line at your mouse-click x-value (try polyval); if this y-value is less than your mouse-y, then the click was above the line.

*What I have

coeff = [3 2 5]; % Define our lines coefficients

x = -10:10; % Define the 21-point x-range to evaluate (and plot)

polval(x)

zeros(2 3)

y = polyval (coeff,x); % Compute the 21 y-values of the line

figure(2); clf; % Open figure 2 and clear the figure (clf)

plot(x,y); grid on; % Plot the line and add a grid

title('Click anywhere on the Axes'); % Display initial instructions to the use

hold on

figure(2);

if % user makes selection above or below function

w = waitforbuttonpress;

axes;

mouse_y= (>=y)

%

get(gca,'CurrentPoint')