how to rotate integer vector from right to left and vis versa

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Abdullah Sultan 2021-11-7

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1580929-how-to-rotate-integer-vector-from-right-to-left-and-vis-versa

评论： DGM 2021-11-8

Write afunction called rotleft that will receiveone row vector as an argument (you mayassume that it is a row vector with a length of at least two) and willreturn another vector, whichconsists of the input vector rotatedto the left—e.g., all values shift over one element, and the first element iswrapped around to theend. For example,

>> rotleft([1 3 4]) ans =

3 4 1

could anyone help please ?

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Abdullah Sultan 2021-11-7

Dear TADA, thank you for your concern, actually it's not hm, I have finished the Matlab subject in last year . Actually, now I train myself. I make a revision to apply for the MATHWORK official exam. Thank you again

Abdullah Sultan 2021-11-8

checkout this and give me your opinion

function Rotatvec = vecRot(vec)

% this function is to rotate vector

% the maximum number mudt user enter is 18

vec= input('enter your max number from 1 to 18:')

vecRot= [20:-1:vec]

end

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Answer 1

DGM 2021-11-7

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https://ww2.mathworks.cn/matlabcentral/answers/1580929-how-to-rotate-integer-vector-from-right-to-left-and-vis-versa#answer_825824

在 MATLAB Online 中打开

Something like this

shamount = 1; % amount to shift left (negative to shift right)
A = 1:5 % test vector
A = 1×5
     1     2     3     4     5
B = circshift(A,[0 -shamount]) % using circshift
B = 1×5
     2     3     4     5     1
C = A(mod((1:numel(A))+shamount-1,numel(A))+1) % using basic indexing
C = 1×5
     2     3     4     5     1

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Abdullah Sultan 2021-11-8

thank you for your help

i'd like to present my work and give me your opinoin

function Rotatvec = vecRot(vec)

% this function is to rotate vector

% the maximum number mudt user enter is 18

vec= input('enter your max number from 1 to 18:')

vecRot= [20:-1:vec]

end

DGM 2021-11-8

在 MATLAB Online 中打开

Pass parameters as input arguments instead of pestering the user for interactive inputs.

The result is assigned to a variable with the same name as the function instead of the output argument.

The rotation method doesn't do what you think it does. Consider:

vec = [12 15 20 17]
vec = 1×4
    12    15    20    17
B = [20:-1:vec] % just creates a linear vector from 20 to vec(1)
B = 1×9
    20    19    18    17    16    15    14    13    12

I already mentioned ways to do this.

myvecrot(1:10,2)
ans = 1×10
     3     4     5     6     7     8     9    10     1     2
myvecrot(1:10,-2)
ans = 1×10
     9    10     1     2     3     4     5     6     7     8
function outvec = myvecrot(invec,k)
    outvec = invec(mod((1:numel(invec))+k-1,numel(invec))+1);
end