Table Find Duplicate Rows (double, char, datetime)

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Dave
Dave 2021년 10월 25일
편집: the cyclist 2021년 10월 26일
Hello, in table A with 100,000 rows and 40 columns, is there a way to find duplicate rows?
The elements are of the type: double, char, datetime
Thanks

답변(1개)

the cyclist
the cyclist 2021년 10월 25일
You might need to share some more details about your table, but you should be able to use the unique function.
% Make some pretend data, which is 8 rows with 4 unique ones
tbl = array2table([magic(4); magic(4)]);
% Find the unique rows, along with indices for identifying the duplicates
[uniqueTableRows,indexToUniqueRows,indexBackFromUnique] = unique(tbl);
See the documentation for details on the indices that are reported.
  댓글 수: 2
the cyclist
the cyclist 2021년 10월 26일
Different data types should not be a problem with this method:
% Make some pretend data of different types
n = [1; 2; 1; 1; 2; 1];
c = {'a';'b';'a';'b';'a';'b'};
t = datetime({'2014-05-26';'2014-08-03';'2014-05-26';'2014-08-03';'2014-05-26';'2014-08-03'},'InputFormat','yyyy-MM-dd');
% Put them in a table
tbl = table(n,c,t)
tbl = 6×3 table
n c t _ _____ ___________ 1 {'a'} 26-May-2014 2 {'b'} 03-Aug-2014 1 {'a'} 26-May-2014 1 {'b'} 03-Aug-2014 2 {'a'} 26-May-2014 1 {'b'} 03-Aug-2014
% Find the unique rows, along with indices for identifying the duplicates
[uniqueTableRows,indexToUniqueRows,indexBackFromUnique] = unique(tbl)
uniqueTableRows = 4×3 table
n c t _ _____ ___________ 1 {'a'} 26-May-2014 1 {'b'} 03-Aug-2014 2 {'a'} 26-May-2014 2 {'b'} 03-Aug-2014
indexToUniqueRows = 4×1
1 4 5 2
indexBackFromUnique = 6×1
1 4 1 2 3 2

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