Matlab While loop help

7 次查看（过去 30 天）

Patrick Flach 2017-5-30

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/342538-matlab-while-loop-help

评论： Patrick Flach 2017-6-4

Hey guys i've been sitting here for 2 hours not finding a solution. There's a population of 400 wildcats. How long will it take them to die out if every year the population is going down by 10% und at least 25. I should use a while loop. Thx in advance :)

3 个评论
显示 1更早的评论隐藏 1更早的评论

Patrick Flach 2017-5-30

编辑：James Tursa 2017-5-30

在 MATLAB Online 中打开

ok sry! for better understanding: i've only one course at university where i use Matlab, so i don't have any experience in it. the only example i'v in my sheets is this one:

x=1
while x<100
Anweisungen;
end

nevermind the language it's german. i have to use a counter and not the display function to show how much iterations it takes till the population dies out. so i know how to use the counter but i don't really know how i can express the decrease of -10% and at least 25 per year in a while loop.

Adam 2017-5-31

Try to work it out in pseudo-code or simple instructions first to make sure you understand the algorithm that is needed. Then you can worry about putting it into Matlab syntax.

请先登录，再进行评论。

请先登录，再回答此问题。

回答（1 个）

ES 2017-5-30

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/342538-matlab-while-loop-help#answer_268947

在 MATLAB Online 中打开

You mean this?

 iPopulation = 400;
  iYr=1;
  while(iPopulation>25)
      iPopulation = floor(0.9*iPopulation); % = 10% decrease
      disp(['At the end of year ', num2str(iYr), ' the population is ', num2str(iPopulation)]);
      iYr = iYr+1;
  end