Hi,

I need help finishing off my iteration code. I can't seem to find

where it is going wrong.

I currently have:

clc

clear all

%define initial conditions and constants

u = 600;

m = 50;

t=0;

p(t)=0;

dt=0.1;

rho = 1.207*(((1-2.333*10e-5)*y)^5);

Fg = -m*9.81;

Fa = [(-1/2*rho*0.4*0.01*abs(v))*v(1)

(-1/2*rho*0.4*0.01*abs(v))*v(2)];

Fp = [(-1/2*rho*1.2*0.05*abs(v))*v(1)

(-1/2*rho*1.2*0.05*abs(v))*v(2)];

p = [(u*cos(theta)*t) ((u*sin(theta)*t)+(1/2*-9.8*t^2))];

v = [((u*cos(theta)*t)+a(1)*t)

((u*sin(theta)*t)+(1/2*-9.81*t^2)+a(2)*t)];

vDir = input('Enter initial angle (deg): ');

%convert theta into radians

theta = theta / 360.0 * (2.0 * pi);

for i = 1:1000

t = t+dt

p(t+dt)=(p(t)+dt)*v(t)

v(t+dt)=(a(t)+dt)*a(t)

if t<15

a(t) = (Fg+Fa)/m

else if t>15

a(t) =(Fg+Fa+Fp)/m

end

end

end

plot (v)

print theta

Thanks in advance

Gavin

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