Reverse an array by for loop

Question

Mohammed 2012-10-10

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/50406-reverse-an-array-by-for-loop

采纳的回答： Wayne King

Hi i got this array : a=[1 2 3 4 5] and i want to reverse it by for loop so it will be a=[5 4 3 2 1]

Thanks

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Answer 1

Wayne King 2012-10-10

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Why a for loop?

 a = [1 2 3 4 5] ;
 b = fliplr(a);

If you must with a for loop

for ii = 1:length(a)
   b(ii) = a(length(a)-ii+1);
end

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Wayne King 2012-10-10

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 a = [1 2 3 4 5] ;
 for ii = 1:length(a)
   b(ii) = a(length(a)-ii+1);
 end

It absolutely works. Just copy and paste the entire code snippet above into the command window.

Matt Fig 2012-10-10

编辑：Matt Fig 2012-10-10

Wayne, Mohammed needs to read the Getting Started section of the documentation. As far as I can tell, he thinks it doesn't work because of the semi-colons. See the comments on my answer for more insight.

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Answer 2

Doug Hull 2012-10-10

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a = fliplr(a)

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Mohammed 2012-10-10

it must be for loop

Doug Hull 2012-10-10

why?

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Answer 3

Matt Fig 2012-10-10

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https://ww2.mathworks.cn/matlabcentral/answers/50406-reverse-an-array-by-for-loop#answer_61531

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An in-place FOR loop would look like:

a = 1:10;
L = length(a);
for ii = 1:L/2
   T =  a(L-ii+1);
   a(L-ii+1) = a(ii);
   a(ii) = T;
end

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Mohammed 2012-10-10

i put this in the matlab but i do not know what's wrong it does not give me an output

Matt Fig 2012-10-10

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You need to read the "Getting Started" section of the documentation. Copy-paste the code I gave into the command window and it will reverse the elements of a. Nothing is wrong, you just didn't look at a after the code ran!! To look at the result, type:

a

at the command window.....

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