Swap the first and last columns
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function B = swap_ends(A)
B = A(:,[end , 2:end-1 , 1]);
end
tried this , but showing error , can any one help ?
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Réponses (4)
Alessandro Galo
le 26 Mar 2019
This works ;)
if size(A,2) ~= 1 & size(A,2) ~= 0
B = A(:,[end , 2:end-1 , 1])
else
B = A;
end
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madhan ravi
le 16 Déc 2018
Modifié(e) : madhan ravi
le 16 Déc 2018
A=rand(4) % example matrix
B = swap_ends(A) % function call
function B = swap_ends(A) % function definition
A(:,[1 end])=A(:,[end 1]);
B=A;
end
Gives:
A =
0.5200 0.8475 0.4965 0.0832
0.7875 0.0289 0.0663 0.1867
0.2765 0.5650 0.1179 0.9095
0.0962 0.7098 0.3063 0.6303
B =
0.0832 0.8475 0.4965 0.5200
0.1867 0.0289 0.0663 0.7875
0.9095 0.5650 0.1179 0.2765
0.6303 0.7098 0.3063 0.0962
A=rand(1,5) % example row vector/column vector
B = swap_ends(A) % function call
function B = swap_ends(A) % function definition
A([1 end])=A([end 1]);
B=A;
end
Gives:
A =
0.6604 0.9767 0.4717 0.8576 0.9269
B =
0.9269 0.9767 0.4717 0.8576 0.6604
1 commentaire
Walter Roberson
le 26 Mar 2019
Modifié(e) : Walter Roberson
le 26 Mar 2019
Alessandro Galo's solution does raise the good point that swapping using end subscript will fail if the array is empty on that dimension, so the swap should be protected with isempty()
Sunil Kumar Giri
le 13 Jan 2020
function B = swap_ends(A)
B = A;
A(:,1) = A(:,end);
A(:,end) = B(:,1);
B = A
end
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ARVIND KUMAR SINGH
le 25 Mai 2020
function B = swap_ends(A)
[~,col] = size(A);
if col<2
B = A;
else
a = A(:,1);
b = A(:,col);
c = A(:,2:col-1);
B =[b c a];
end
end
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