如何在矩阵中移动列（左或右）？

Posted 2023-02-16

【中文标题】如何在矩阵中移动列（左或右）？

【英文标题】：How do I shift columns (left or right) in a matrix?

【发布时间】：2020-08-08 21:35:26

【问题描述】：

我想非循环移动我的矩阵，然后将零填充到左侧或右侧（取决于移位），即如果矩阵向右移动，零将被填充到左侧。

我使用的是 MATLAB 2019b，到目前为止我的代码如下所示：

%dummy data
data = rand(5, 16);

channelSink = 9; %this variable will either be >layerIV, <layerIV or =layerIV
layerIV = 7;
diff = layerIV - channelSink;

for channel = 1:16
    
        if channelSink > layerIV 
            
            %shift columns to the left by ab(diff)
            %and
            %set columns shifted by ab(diff) to zero
            
        elseif channelSink < layerIV
            
            %shift columns to the right by diff
            %and
            %set columns shifted by diff to zero
            
        else %idiff = 0, don't shift
              
              diff = 0; 
              disp('Sink at channel 7; not necessary to re-align');
             
        end
        
    end

提前谢谢你

【参考方案1】：

这会将矩阵data 水平移动d 位置，如果d 为正则向右移动，如果为负则向左移动，用零填充另一侧：

data = rand(5, 16); % example matrix
d = 3; % shift; positive/negative for right/left
result = zeros(size(data), 'like', data); % preallocate with zeros
result(:,max(1,1+d):min(end,end+d)) = data(:,max(1,1-d):min(end,end-d)); % write values