Storing index logic in new column per iteration

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Annette Ciecierega 2021-11-2

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评论： Annette Ciecierega 2021-11-3

For each idx variable, I want the values to be stored in a new column per iteration. Right now, each idx is being overwritten per loop iteration. I do not want the idx logic to be stored in one column with new rows; each iteration should make a new column in the idx logic field.

for j = 2:length(fieldnames(data))

for i = 1:(length(fieldnames(data))-1)

firstoutput = data.(sprintf("variables_%d", i));

secondoutput = data.(sprintf("variables_%d",j));

data.idx2 = ismember(firstoutput(:,2),secondoutput(:,2));

data.idx3 = ismember(firstoutput(:,3),secondoutput(:,3));

data.idx4 = ismember(firstoutput(:,4),secondoutput(:,4));

end

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回答（1 个）

Timothy 2021-11-2

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编辑：Timothy 2021-11-2

在 MATLAB Online 中打开

You would need to use i and/or j, depending on how you are thinking of an "iteration" for your algorithm, as indices into your data.idx# fields. If i and/or j are large, I would also recommend pre-allocating them as a logical/boolean vector/matrix, as appropriate for your definition of iteration.

For example, it seems like you would want to store all combinations of i and j, based on your code so you might do something like this:

L = length(fieldnames(data));
data.idx2 = zeros(L-1, L-1, 'logical');
data.idx3 = data.idx2;
data.idx4 = data.idx2;
for j = 2:L
 for i = 1:L-1
  firstoutput = data.(sprintf("variables_%d", i));
  secondoutput = data.(sprintf("variables_%d",j));
  data.idx2(i,j) = ismember(firstoutput(:,2),secondoutput(:,2));
  data.idx3(i,j) = ismember(firstoutput(:,3),secondoutput(:,3));
  data.idx4(i,j) = ismember(firstoutput(:,4),secondoutput(:,4));
 end
end