counting number of times commadn executed in while loop

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Rick 2014-6-21

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https://ww2.mathworks.cn/matlabcentral/answers/136762-counting-number-of-times-commadn-executed-in-while-loop

评论： Roger Stafford 2014-6-21

Hello,

I am working on a problem where I need to know how many years it would take for interest being compounded annually to be twice the intial investment. for Initial investment of $1000, here is my code at a rate of 5%

FinalValue = Investment;
while FinalValue < 2*Investment; 
    FinalValue = FinalValue + Rate*FinalValue;
end

but I dont know how to assign numYears to the number of years (number of executions) of this loop.

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Answer 1

Roger Stafford 2014-6-21

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https://ww2.mathworks.cn/matlabcentral/answers/136762-counting-number-of-times-commadn-executed-in-while-loop#answer_141870

在 MATLAB Online 中打开

   FinalValue = Investment;
   Count = 0;
   while FinalValue < 2*Investment; 
      FinalValue = FinalValue + Rate*FinalValue;
      Count = Count+1;
   end

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Rick 2014-6-21

could you explain how that works? What is Count+1??

Roger Stafford 2014-6-21

在 MATLAB Online 中打开

'Count' is a count of the number of times you have executed the line

FinalValue = FinalValue + Rate*FinalValue;

which is presumably the number of years you have accumulated interest in doubling your initial investment. It increases by one for each trip through the while-loop.

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