Find differences between 2 tables

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Dion Theunissen
Dion Theunissen on 26 Aug 2022
Edited: dpb on 26 Aug 2022
I have to tables, an old one and a new one.
Is there a function or a way to check what the differences are between 2 tables based on checking rows?
So in this example, my output needs to be row 2 cause the other rows are identical.

Answers (3)

Voss
Voss on 26 Aug 2022
If your tables are the same size and both contain all numeric data, then this would work:
% create some tables:
t1 = table([1;2;3],[4;5;6],[7;8;9])
t1 = 3×3 table
Var1 Var2 Var3 ____ ____ ____ 1 4 7 2 5 8 3 6 9
t2 = table([1;2;3],[4;15;6],[7;8;9])
t2 = 3×3 table
Var1 Var2 Var3 ____ ____ ____ 1 4 7 2 15 8 3 6 9
% find rows that are different:
row_different = find(~all(t1{:,:} == t2{:,:},2))
row_different = 2

Cris LaPierre
Cris LaPierre on 26 Aug 2022
You could try using setdiff.
If A and B are tables or timetables, then setdiff returns the rows from A that are not in B.

dpb
dpb on 26 Aug 2022
Edited: dpb on 26 Aug 2022
ix=(any(A{:,:}~=B{:,:},2)&all(isfinite([A{:,:} B{:,:}]),2))|(all(isnan(A{:,:})~=isnan(B{:,:}),2));
This is somewhat tricky because NaN compares as isequal() to nothing, including itself so it will always show up.

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