Need help getting the points to move separately.

Attached are a script and a function file. For the script if I run it before doing the steps it'll have 20 points in different places, but after I put in the velocities they all converge, any idea on how to get each point to move separately. I need all of the velocities to be rand which is why I created a function to do a random velocity based on gaussian distribution.

[KALYAN ACHARJYA]

Are you talking these points? Small case x,y,z?

[Devon Romine]

Yes, if you run the program with the for statement commented out, the 20 points will be in randomized positions, but as you can see with the for statement they condense down and I do not know how to fix that.

Answer 1

[KALYAN ACHARJYA]

% Do this one, insert x, y, z, within for loop

    % Modification 
  for i=1:20
    x=r.*sin(theta).*cos(phi);
    y=r.*sin(theta).*sin(phi);
    z=r.*cos(theta);
    x(i+1)=x(i)+velocities_fun(x)*dt;
    y(i+1)=y(i)+velocities_fun(y)*dt;
    z(i+1)=y(i)+velocities_fun(z)*dt;
end

[Devon Romine]

Thank you that helped alot, will this run through all 20 time steps?

[KALYAN ACHARJYA]

You can more do that, by keep r, theta, phi in the loop. All having a random function, so it within the loop, gives different points