Subtracting elements within a table

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I have a table:
1 23
2 24
3 21
4 34
1 89
2 23.2
3 34.8
4 -23.1
and it continues with the first column always being in the sequence 1-2-3-4.
I need to subract the first element next to 1 from the second element next to 1, so: 89-23. Then all elemets represented by the number 2 in the 1st column, so: 23.2-24. etc.
The outcome should be the following vector: [66 -0.8 13.8 -57.1].

Accepted Answer

Arif Hoq
Arif Hoq on 13 Feb 2022
A=[1 23
2 24
3 21
4 34
1 89
2 23.2
3 34.8
4 -23.1];
My_Table= table(A(:,1),A(:,2))
My_Table = 8×2 table
Var1 Var2 ____ _____ 1 23 2 24 3 21 4 34 1 89 2 23.2 3 34.8 4 -23.1
B=table2array(My_Table(:,2));
ind1 = 1:4;
ind2 = ind1 + 4;
output=B(ind2)-B(ind1)
output = 4×1
66.0000 -0.8000 13.8000 -57.1000
  1 Comment
Lu Da Silva
Lu Da Silva on 15 Feb 2022
worked perfectly, thanks!
Since the table is actually longer, I made a small adjustment:
ind1 = 1:length(B)-4;

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