A very simple while loop

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Truman Cassady
Truman Cassady 2018-4-14
评论： Truman Cassady 2018-4-14
while tol<10E-6
E= M+e*sin(E)
n=n+1;
E = M + (M+e*sin(E))
tol(:,1)= E(n+1)-E(n)
end
If I don't assign an index to the E value in this loop how can I reference two values in the sequence. Everything works, but I just need clarification on the index values for the tol variable.

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回答（1 个）

Walter Roberson
Walter Roberson 2018-4-14
while tol<10E-6
means the same thing as
while all(tol(:)<10E-6)
When you make tol a vector then all of the entries have to be true in order to proceed.
If you do not need a record of the tol values, then just assign tol = E(n+1)-E(n) ;
If you do need a record of the tol values, then use while tol(end)<10E-6
... Or probably, while abs(tol(end))>10E-6 since you probably want to stop when the you get close enough.
  1 个评论
Truman Cassady
Truman Cassady 2018-4-14
I posted an updated screen capture of my code. Thank you for responding to me on a Saturday btw. I can't correctly build a new tolerance value with each successive iteration.

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