If I want to have x as a 3 element vector say [2,3,2], how to I write a loop to iterate over each value in the array for x?

Question

Madison Goodwin 2018-4-30

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/398168-if-i-want-to-have-x-as-a-3-element-vector-say-2-3-2-how-to-i-write-a-loop-to-iterate-over-each-va

回答： Jan 2018-4-30

 n = n + 1;
t(n+1) = t(n) + deltat;
%x(t+deltat) = x(t) + v(t).*deltat
x(n+1) = x(n) + v(n).*deltat;
 %a(t) = agravity + fdrag(t)./m 
atotal(n) = agravity(n) + fdrag(n)./m;
 %vdrag(t) = v(t) - vwind
vdrag(n) = v(n) - vwind(n);
 %Magfdrag = norm(fdrag)
magfdrag = norm(fdrag);
 %Magfdrag(t) = 0.5*p*Cd*A.*(norm(vdrag)).^2
magfdrag(n) = 0.5*p*Cd*A.*(norm(vdrag)).^2;
 %fdrag = norm(fdrag(t)).*(-vdrag(t)/norm(vdrag(t)))
fdrag = norm(fdrag(n)).*((-vdrag(n))/norm(vdrag(n)));
 %v(t+deltat) = v(t) + a(t).*deltat
v(n+1) = v(n) + atotal(n).*deltat;

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Answer 1

Jan 2018-4-30

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/398168-if-i-want-to-have-x-as-a-3-element-vector-say-2-3-2-how-to-i-write-a-loop-to-iterate-over-each-va#answer_317893

在 MATLAB Online 中打开

x0 = [2,3,2];
t  = zeros(1000, 1);
x  = zeros(1000, 3);
v  = zeros(1000, 3);
x(1, :) = x0;
n = 1;
while <Your Condition to stop the loop>
  n         = n + 1;
  t(n+1)    = t(n) + deltat;
  x(n+1, :) = x(n, :) + v(n, :) .* deltat;
  ...
  v(n+1, :) = v(n, :) + atotal(n, :) .* deltat;
end