Save data from while 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 

Answer 1

[per isakson]

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.

Answer 2

[madhan ravi]

You don’t need a loop , simply define t as

t = 0:dt:100;
doc while % to know more about the loop
doc for

and use element wise operation ( https://in.mathworks.com/help/matlab/matlab_prog/array-vs-matrix-operations.html ) meaning * to .* and ^ to .^