Find differences between 2 tables

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Dion Theunissen
Dion Theunissen 2022-8-26
编辑： dpb 2022-8-26
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.

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回答（3 个）

Voss
Voss 2022-8-26
Ran in:
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 2022-8-26
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 2022-8-26
编辑：dpb 2022-8-26
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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