Left-rotating a vector

we define a vector A and create a new vector B containing the elements of A shifted one index to the left.

% As an example

A B

[ 1 2 3 4 ] [ 2 3 4 1 ]

[ 5 3 8 ] [ 3 8 5 ]

% My code

A = [1,2,3,4,5];

B = [];

for i = 2:length(A)

% A(1) = B(end);

B = [B A(i)];

end

disp(B);

% The program showed Array indices must be positive integers or logical values.

% i do not know how to improve my code

% Thank you all

Answer 1

[Alan Stevens]

You define B as a null vector so it doesn't have an "end".

Try, simply

A = [1,2,3,4,5];
B = [A(2:end) A(1)]

B = 1×5

2 3 4 5 1

[Shuoze Xu]

Thank you.

But i want to do it by using a for loop.

Do you have any suggestion?

[Shuoze Xu]

I think i know how to do it.

Thank you for your idea and help