Repeat array onto the same row

Question

Leonardo 2023-9-9

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链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2018921-repeat-array-onto-the-same-row

评论： Leonardo 2023-9-9

采纳的回答： Paul

I want A=[1,2,3,4] to

become A=[1,2,3,4,1,2,3,4] by x2

or

become A=[1,2,3,4,1,2] by x1.5

is it possible?

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Answer 1

Paul 2023-9-9

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https://ww2.mathworks.cn/matlabcentral/answers/2018921-repeat-array-onto-the-same-row#answer_1306141

在 MATLAB Online 中打开

A=[1,2,3,4]
A = 1×4
     1     2     3     4
horzcat(A,A)
ans = 1×8
     1     2     3     4     1     2     3     4
horzcat(A,A(1:floor(numel(A)/2)))  % or use ceils depending on how you want to handle the case where numel(A) is odd
ans = 1×6
     1     2     3     4     1     2

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Leonardo 2023-9-9

Thank you!

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Answer 2

Dyuman Joshi 2023-9-9

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2018921-repeat-array-onto-the-same-row#answer_1306146

编辑：Dyuman Joshi 2023-9-9

在 MATLAB Online 中打开

Here's a generalised code -

A=[1,2,3,4];
B = repetition(A,2)
B = 1×8
     1     2     3     4     1     2     3     4
B = repetition(A,1.5)
B = 1×6
     1     2     3     4     1     2
B = repetition(A,2.75)
B = 1×11
     1     2     3     4     1     2     3     4     1     2     3
B = repetition(A,3.3)
Error using solution>repetition
Incompatible number for repetition

function B = repetition(A,n)
B = repmat(A,1,ceil(n));
k = numel(A)*n;
    %k needs to be an integer to repeat an array by a non-integer number
    %Check for a number being an integer is the reminder when divided by 1 is zero
    if rem(k,1)
        error('Incompatible number for repetition');
    else
        B = B(1:k);
    end
end