MATLAB: Using parametric equations in terms of theta1 and theta2 to plot a point A for a range of angles

parametric equationsplotting parametric equations

I am trying to write a code that uses two parametric equations of x and y, which depend on the variables theta1 and theta2. Then I have to produce a plot of x Vs y for a range of values of theta1 and theta2. I am stuck how can I do this?
Bellow is my current code to display the coordinate of this point defined by the parametric equations a and b (btw this code doesn't work for reasons that I do not understand). Now I have to use these functions to produce an array that will plot the x,y coordinates over a range of values of theta1 (20 to 80 deg in increments of 0,5) and of theta2 (90 to 30 deg in increments if 0,5).
Thanks in advance for any help! Started Matlab a few weeks ago 🙂 (I attached a screenshot of the question)
n1 = input('Enter θ1: '); 
n2 = input('Enter θ2: ');
function a = first_calc(n1,n2)
    a = 0.6*cosd(n1) + 0.2*cosd(n1-n2);
end
function b = second_calc(n1,n2)
    b = 0.6*sind(n1) + 0.2*sind(n1-n2);
end
fprintf('The value for x is %g, and that of y is g%\n' a,b);

Best Answer

Hey Raphael,
In this case you have defined a function but not called it in your script and so you are getting an error while printing the a and b variables.
You can just call the function in your script as
a = first_calc(n1,n2);
b = second_calc(n1,n2);
You can get the example on it here.
Secondly to create an array –
Theta1=20:0.5:80;
Theta2=90:-0.5:30;
You can learn how to use the plot function here.
Related Question