MATLAB: How to shift columns (left or right) in a matrix

for loopif statementMATLABmatrixnon-circular shift

Hi All,
I would like to non-circularly shift my matrix and then have zeros padded to either the left or right (depending on the shift) i.e. if the matrix shifts to the right, zeros would be padded to the left.
My code so far looks like this:
%dummy data
data = rand(5, 16);
channelSink = 9; %this variable will either be >layerIV, <layerIV or =layerIV
layerIV = 7;
chDiff = layerIV - channelSink;
    
    for channel = 1:16
    
        if channelSink > layerIV 
            
            %shift columns to the left by ab(chDiff)
            %and

            %set columns shifted by ab(chDiff) to zero
            
        elseif channelSink < layerIV
            
            %shift columns to the right by chDiff
            %and
            %set columns shifted by chDiff to zero
            
        else %if chDiff = 0, don't shift
              
              chDiff = 0; 
              disp('Sink at channel 7; not necessary to re-align');
             
        end
        
    end
Thank you in advance.

Best Answer

shift = abs(diff)
%left
data = [data(:, shift+1:end), zeros(size(data,1),shift)]
%right
data = [zeros(size(data,1),shift), data(:, end-shift:shift)];
Note: we recommend against using diff() as a variable name, as it conflicts with the common function diff() . If nothing else, it will tend to confuse other people who read your code.
Related Question