How to circ shift rows by different increments

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hbcukid 2021-2-22

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https://ww2.mathworks.cn/matlabcentral/answers/752284-how-to-circ-shift-rows-by-different-increments

评论： hbcukid 2021-2-24

I have a 100x100 matrix and I am trying to figure how to shift them in different increments. For example I want row 1 to shift by none, row 2 by 10, row 3 by 20, row 4 by 30, and row 5 by 40 and for it to repeat this process every 5 rows. How can I achieve this?

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Answer 1

hbcukid 2021-2-23

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https://ww2.mathworks.cn/matlabcentral/answers/752284-how-to-circ-shift-rows-by-different-increments#answer_631299

编辑：hbcukid 2021-2-24

在 MATLAB Online 中打开

A = rand(100,100);
Fill_Value = 0;
for Target_Group = 1: +5: length(A)   
    for Relative_Row = 0: 4
        Row = Target_Group+Relative_Row;
        Shift_Value = Relative_Row*10;
        A(Row,:) = [Fill_Value*ones(1,Shift_Value) A(Row,1:end-Shift_Value)];
    end    
end

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Stephen23 2021-2-24

在 MATLAB Online 中打开

Simpler:

B = zeros(size(A));
for k = 1:size(A,1)
    x = mod(k-1,5)*10;
    B(k,1+x:end) = M(k,1:end-x);
end

hbcukid 2021-2-24

Oh wow thanks

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Answer 2

Jan 2021-2-22

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/752284-how-to-circ-shift-rows-by-different-increments#answer_629824

编辑：Jan 2021-2-22

在 MATLAB Online 中打开

What does "shift" mean? Circular shifting the elements? Adding a value to the contents of the elements?

A = rand(100, 100);
s = [0, 10, 20, 30, 40];
% For circular shifting the elements:
for k = 1:100
    sk      = s(mod(k - 1, 5)) + 1;  % 1:100 -> 1,2,3,4,5,1,2,3,4,5,...
    A(k, :) = circshift(A(k, :), sk);
end
% Or if "shift" means adding to the values is meant:
A = A + repmat(s(:), 20, 1);

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