subtract rows under a condition

조회 수: 5 (최근 30일)
Boram Lim
Boram Lim 2018년 5월 3일
답변: Guillaume 2018년 5월 6일
I am trying to create a data by subtracting rows that meet a condition. A sample of my data is this
dataA =
id value
1 1
1 2
1 3
1 4
2 5
2 6
2 7
3 8
3 9
3 10
4 11
4 12
4 13
5 14
5 15
5 16
I have a vector this
my_vector =
1
3
4
1
With data A, I would like to subtract rows that are only included in my_vector. In my_vector, there are two 1 so I would like to subtract rows with id 1 twice. So, here is what I want to have
id value
1 1
1 2
1 3
1 4
3 8
3 9
3 10
4 11
4 12
4 13
1 1
1 2
1 3
1 4

답변 (2개)

JESUS DAVID ARIZA ROYETH
JESUS DAVID ARIZA ROYETH 2018년 5월 4일
solution:
dataA = [1 1
1 2
1 3
1 4
2 5
2 6
2 7
3 8
3 9
3 10
4 11
4 12
4 13
5 14
5 15
5 16];
my_vector =[ 1
3
4
1];
[x,~]=find(bsxfun(@eq, dataA(:,1),my_vector'));
newdataA=dataA(x,:);
  댓글 수: 5
Guillaume
Guillaume 2018년 5월 4일
편집: Guillaume 2018년 5월 4일
There is never any raison to use table2array to extract a column from a table, table2array(dataA(:, 1)) is a roundabout way of getting:
dataA{:, 1}
or using . indexing:
data.id
Overall, a simpler version for R2016b or later:
[rows, ~] = find(dataA.id == my_vector');
newdataA = dataA(rows, :);
Boram Lim
Boram Lim 2018년 5월 5일
Since the size of data is too large, there is such an error
Out of memory. Type HELP MEMORY for your options.
Error in Model01_interpolated_May1 (line 70) [rows, ~] = find(dta2.decision_id == sampled_id01');

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Guillaume
Guillaume 2018년 5월 6일
Since the size of data is too large
Then you'll have to use a loop, explicitly or with arrayfun:
newdataA = arrayfun(@(v) dataA(ismember(dataA.id, v), :), my_vector, 'UniformOutput', false);
newdataA = vertcat(newdataA{:})

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