Reverse an array by for loop

2012 10 10
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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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Wayne King
Wayne King 2012-10-10

0 个投票

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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Mohammed
Mohammed 2012-10-10
IT does not work.. when i input this in the matlab it gives me nothing
Wayne King
Wayne King 2012-10-10
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
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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更多回答（2 个）

Matt Fig
Matt Fig 2012-10-10

0 个投票

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
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
Matt Fig 2012-10-10
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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