MATLAB: Save data from while loop

matlab functionmatrix arraywhile loop

How I can save x,y,z data from each irritation and build a matrix ? So I can use them for future work … 
t=0;
while t<100 
    v=pi/10;
    r=6;
    dt=0.1;
    w=v/r;
    t=t+dt;
    theta=pi/2;
    x=r*sin(theta-w*t)
    y=r*cos(theta-w*t)
    z=sqrt(10^2-x^2-y^2)
end

Best Answer

Your script overwrites x,y,z for each iteration. You need to assign vectors of appropriate length to x,y,z , (preallocate) before running the loop. Try 
t=0;
ix=0;
v=pi/10;
r=6;
dt=0.1;
w=v/r;
x = nan(round(100/dt),1);
y = x;
z = x; 
while t<100 
    ix = ix + 1;
    t=t+dt;
    x(ix)=r*sin(theta-w*t);
    y(ix)=r*cos(theta-w*t);
    z(ix)=sqrt(10^2-x^2-y^2);
end
Just to learn how to use a loop, despite it is not neccessary in your example.
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