How would one reverse the order of an array using a while loop?

Question

Justin Keach 2016-10-30

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https://ww2.mathworks.cn/matlabcentral/answers/309885-how-would-one-reverse-the-order-of-an-array-using-a-while-loop

评论： Walter Roberson 2016-10-31

For this homework question I am asked to write a program using the while loop that will display a given row or column vector in reverse.

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Answer 1

Asad (Mehrzad) Khoddam 2016-10-30

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https://ww2.mathworks.cn/matlabcentral/answers/309885-how-would-one-reverse-the-order-of-an-array-using-a-while-loop#answer_241342

在 MATLAB Online 中打开

if v is the vector:

n=length(v);
while n>0
   disp(v(n));
   n=n-1;
end

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Justin Keach 2016-10-30

Thank you! That works, but now I need to convert each output back into a vector so that if v=[1 2 3 4] my answer will return as v1= [4 3 2 1]. My current attempts have only returned my row vector as the final element/final output of the loop.

Justin Keach 2016-10-30

在 MATLAB Online 中打开

v=Array2;
k=length(v);
while k>0;
   disp(v(k));
   k=k-1;
end
disp(['The original array was: ' mat2str(v)]);

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Answer 2

Walter Roberson 2016-10-30

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Supposed the length of your vector is L. Then you want to copy position j to position L-j+1 in the new vector. For example, length 6, position 1 gets written to position 6-1+1 = 6; position 2 gets written to position 6-2+1 = 5, position 3 to position 6-3+1 = 4, and so on.