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I want to merge the content of two tables with identical variables, but for a given key variable value the columns 1:N in table 1 are filled and columns N+1:end in the other.

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Ronald Ouwerkerk
Ronald Ouwerkerk on 18 Sep 2017
This is what I would like to achieve: A = table({'a'}, 5, 15, 25, 0, 0, 0,'VariableNames',{'A1','A2', 'A3', 'A4', 'B1', 'B2', 'B3'}) A = A1 A2 A3 A4 B1 B2 B3 _
'a' 5 15 25 0 0 0
>> B = table({'a'}, 0, 0, 0, 6, 12, 18,'VariableNames',{'A1','A2', 'A3', 'A4', 'B1', 'B2', 'B3'}) B = A1 A2 A3 A4 B1 B2 B3 _
'a' 0 0 0 6 12 18
>> What operation would yield table C (matching the values of variable 'A1'): C = table({'a'}, 5, 15, 25, 6, 12, 18,'VariableNames',{'A1','A2', 'A3', 'A4', 'B1', 'B2', 'B3'}) C =
A1 A2 A3 A4 B1 B2 B3
___ __ __ __ __ __ __
'a' 5 15 25 6 12 18

Answers (1)

Ramnarayan Krishnamurthy
Ramnarayan Krishnamurthy on 21 Sep 2017
Edited: Ramnarayan Krishnamurthy on 21 Sep 2017
Merging 2 tables on the basis of key variables and retaining only the common rows can be achieved using the 'innerjoin' function.
For the requirements in this question, we would need to manipulate the input data A and B, so that only the desired columns from both the tables are selected
t = innerjoin(A(:,[1:4]),B(:,[1,5:end]),'LeftKeys',1,'RightKeys',1);
t =
A1 A2 A3 A4 B1 B2 B3
___ __ __ __ __ __ __
'a' 5 15 25 6 12 18
Additionally, to generalize the above code where N is the number of filled columns in Table 1:
N = 4;
t = innerjoin(A(:,[1:N]),B(:,[1,N+1:end]),'LeftKeys',1,'RightKeys',1);
The documentation for the 'innerjoin' function is available at: https://www.mathworks.com/help/matlab/ref/innerjoin.html
Hope this helps!

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