Filtering a matrix column with different cutoff

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Bruno 2016-3-26

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评论： Bruno 2016-3-26

I’ ve looking for a method to filter each column of data (101X62) with specific cutoff (1X63). Please, could someone indicate me the problem? Thanks B

x=data
fs=60; 
fc=cutoff;
for idx = 1:numel(x);
    [b,a] = butter(2, fc/(fs/2));
    y = filter(b,a,x); %// output
end

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Bruno 2016-3-26

Hi Ced, cutoff frequency (1x62) are different for each column.

Ced 2016-3-26

Yes, but since you are designing your filter in the loop, you can select a different cutoff for each loop iteration, right? Have a look at Image Analyst's answer, he wrote it out for you. You of course still have to define your cutoff vector.

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采纳的回答

Image Analyst 2016-3-26

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https://ww2.mathworks.cn/matlabcentral/answers/275549-filtering-a-matrix-column-with-different-cutoff#answer_215129

编辑：Image Analyst 2016-3-26

在 MATLAB Online 中打开

Perhaps you meant this:

[rows, columns] = size(data);
y = zeros(size(data));
fs = 60;
for k = 1 : columns
  thisColumn = data(:, k); % Extract this one column
  fc = cutoff(k); % Extract this one cutoff value.
  % Determine filter parameters.
  [b,a] = butter(2, fc/(fs/2));
  % Do the filtering, and put result into column k of the output y
  y(:,k) = filter(b, a, thisColumn);
end