MATLAB: Trouble with a simple issue in the projectile motion problem

motionprojectile

Hey all!
Im doing a porject where i find the projectile motion of a object in the air and im having several issues.
  1. i want my time to not be going from 0 to 10,000 with an interval of .01. This takes up space but im not sure how else i could do this.
  2. I want the user when they input air resistance to be able to just click enter and it'll automatically set air=.5
  3. the code with the fprint works well but im having some problems making the plot . Height3 kept on giving me an array error and that was only fixed when I changed 0 to .01.
  4. Also with the previous problem, height3 (which is supposed to be the vertical height when the object is above height 0) has an error and doesnt become a matrix. Im trying to plot it with time2 and they both have to be the same size matrix.
I guess my biggest problem is I want my code to work for small and large velocities and with smaller velocities my code will not work so I'm trying to make it work. Im guessing a For function will work better, but i just learned those so im not super confident. 
clear , clc
g=9.8;
ang=input('Enter incident angle: ');
if (ang<=0)
    disp('Illegal Input')
end
v=input('Enter speed(m/s): ');
if (v<=0)
    disp('Illegal Input')
end
air=input('Enter air resitiance (Will otherwise be .5): ');
if air<=0,' ';
    air=.5;
end
vx0=v*cosd(ang);
vy0=v*sind(ang);
t=(0:.01:10000);
height=vy0*t-.5*g*t.^2;
land=find(height>=0);
time=(land(end)-1)/100;
dist=vx0*time;
height2=vy0*time-.5*g*time.^2;
fprintf('Distance is %g m \n',dist);
fprintf('Max Height is %g m \n',height2);
fprintf('Time was %g sec \n ',time);
time2=(0:.001:time);
height3=height(.01:time2);
plot(height3,time2)

Best Answer

Here is the solution
Related Question