Matlab Kinematics question

1. Dec 11, 2004

starbaj12

I know this is a programming language question, but no one seems to answer in that Forum. I'm running a program in Matlab and I'm running two loops One for the velocities in the x,y,z components and another for the magnus force (spin) vx,vy,vz. I'm holding all constant except vy and vz which I switch one at a time while holding the other constant. I need to find the spin in the vy then the vz that makes it within my constraints I have in place in my program. I try running now but it is just non-stop numbers that come out any help will be great. Thank you

clear;
Cd = .5;
Cs = .5;
p = 1.2; %Air density
m = .4536; %mass

x(1) = 0; %initial position
y(1) = 0;
z(1) = 0;

wx = 0; %initial angular velocity for x

wy = 0;

vx(1) = 14.95; %intial velocity for x
vy(1) = 14.5;
vz(1) = 7.9;
k = -300;
g = 9.81; %gravity
dt = .001;
t = 20;
n = t/dt;

for j = 1:n
wz = j;
for i = 1:n

u = sqrt((vx(i))^2+(vy(i))^2+(vz(i))^2); %v for all components

ax = (-((Cd*p*pi*r^2)*u*vx(i))/(2*m) - ((Cs*p*pi*r^3*(vz(i)*wy-wz*vy(i)))/(2*m)));
ay = (-((Cd*p*pi*r^2)*u*vy(i))/(2*m) - ((Cs*p*pi*r^3*(wz*vx(i)))/(2*m)));
az = ((-g)-((Cd*p*pi*r^2)*u*vz(i))/(2*m) + ((Cs*p*pi*r^3*(-wy*vx(i)))/(2*m)));

Fx = ax*m; %Force for x-component
Fy = ay*m;
Fz = az*m;

vx(i+1) = vx(i) + ((Fx/m)*dt); %Final velocity for x-component
vy(i+1) = vy(i) + ((Fy/m)*dt);
vz(i+1) = vz(i) + ((Fz/m)*dt);

x(i+1) = x(i) + vx(i+1)*dt;
y(i+1) = y(i) + vy(i+1)*dt;
z(i+1) = z(i) + vz(i+1)*dt;

if(x(i+1)>(11.531+ .1524))

break
end

if((y(i+1)>10.9564)&(y(i+1)<11.531))&((z(i+1)>1.8288)&(z(i+1)<2.3254))&((x(i+1)>11.531)&(x(i+1)<(11.531+.1524)))
fprintf('q')
break

end

end
fprintf('number %g',wz);
end

plot3(x,y,z)
grid on