Projectile motion in matlab help

[caseyk]

Hey guys, I'm pretty new to MATLAB and I've been messing around this for a couple hours now and I could use some help.

I need to "Write a MATLAB program that calls at least one user defined function to calculate the ball movement and plot the result in 0.01 second increment before the ball drops to the floor. Use GUI to take the following user input: the height of the launcher (in), initial launch speed (ft/sec), and launch angle from horizon (degree). "

There are a bunch of given equations I can use
"vx = vx0 + ax t x = x0 + vx0t + ½ ax t2 vx2 = vx02 + 2 ax (x – x0)
vy = vy0 + ay t y = y0 + vy0t + ½ ay t2 vy2 = vy02 + 2 ay (y – y0)
For projectile motion, ax = 0, ay = -g, gravity g = 32.2 ft/sec2"

What I need help with is creating the m file that can calculate the motion if the givens are entered into a gui. thanks!

 

[NateD]

Here is some code you can start with. This code sets up a GUI and takes the user input from the GUI. You will need to write your own code to calculate the ball movement and plot the result. %Create figure window f = figure('Name', 'Projectile Motion'); %Create GUI elements h1 = uicontrol('style','text','string','Height of Launcher (in)','position',[20 100 160 20]); h2 = uicontrol('style','edit','string','','position',[180 100 160 20]); h3 = uicontrol('style','text','string','Initial Launch Speed (ft/sec)','position',[20 60 160 20]); h4 = uicontrol('style','edit','string','','position',[180 60 160 20]); h5 = uicontrol('style','text','string','Launch Angle (degrees)','position',[20 20 160 20]); h6 = uicontrol('style','edit','string','','position',[180 20 160 20]); %Create pushbutton h7 = uicontrol('style','pushbutton','string','Calculate','position',[180 350 160 20],'callback',@calculate); %Callback function for pushbutton function calculate(~,~) %Get user input from GUI height = str2double(get(h2,'string')); speed = str2double(get(h4,'string')); angle = str2double(get(h6,'string')); %Calculate ball motion and plot result %Write code here end

 

[oswaler]

I would suggest breaking down the problem into smaller parts and tackling them one at a time. First, you can create a user-defined function that calculates the projectile motion using the given equations. This function can take in the initial parameters (height, speed, angle) as inputs and return the x and y coordinates of the projectile at each time increment.

Next, you can create a GUI that takes in the user input for the initial parameters and calls the user-defined function to calculate the motion. The GUI can also plot the trajectory of the projectile using the x and y coordinates from the function.

It may also be helpful to break down the problem into smaller tasks and test each part separately before putting it all together. This can help identify any errors or bugs in the code. Additionally, there are many resources available online for using MATLAB and creating GUIs, so utilizing those can also be helpful in completing this task. Good luck!