Make a numerical iteration using while loop

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Ornella Fanais
Ornella Fanais 2017-3-23
评论： Ornella Fanais 2017-3-24
Hello everyone, I'm new!! How can I make a iteration process whit While Loop?
  1. I have this formula: T_tc=((sigma*ew*(Tw^4-Tb^4))/h)+Tinf
  2. I know sigma, ew,Tw,h,Tinf
  3. I have to start the iteration process to Tb value for example 20
  4. for the next iteration I have to use the result of T_tc.
  5. the condition is: I have to stop when I find a steady result.
The script that I write is:
Tb=20
T_tc=((sigma*ew*(Tw^4-Tb^4))/h)+Tinf
while T_tc<Tb
Tb=T_tc
end
Thanks

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回答（1 个）

Roger Stafford
Roger Stafford 2017-3-23
You need to place the computation of T_tc inside the while loop. As it stands, there will be no change to Tb after the first trip through. Also the “steady” condition probably needs to be changed to some tolerated absolute difference.
Tb=20;
T_tc=((sigma*ew*(Tw^4-Tb^4))/h)+Tinf;
while abs(T_tc-Tb) > tol % ’tol’ is some tolerated difference
Tb=T_tc;
T_tc=((sigma*ew*(Tw^4-Tb^4))/h)+Tinf;
end
[Note: Equality of your equation will be with one of the four roots of a quartic equation. Which of the four is found may depend on what initial value for Tb you begin with.]
  1 个评论
Ornella Fanais
Ornella Fanais 2017-3-24
how can i do if don't use while loop, and I use for loop ? For example for i=293:1273 T(i)=(((sigma*ew*(Tw^4-Tb(i)^4))/h)+Tinf) end I do to start the cicle to 293=Tb and I need to get all value of T because I would to create a plot. Thanks for your help

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