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Add newer data to older data without repetition

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Martin
Martin 2018-2-17
回答： Peter Perkins 2018-2-17
Imagine 2 two datasets where column 1 is a timestamp, column 2 is data (can be more columns).
Yesterday i had this:
A = [ 1 2 3 4 5 6 7 ; 435 124 525 342 532 533 213 ]'
Today I get this (Rows each day can vary):
B = [ 5 6 7 8 9 10 ; 532 533 213 988 999 777 ]'
So 5:7 (timestamp) overlaps. Any idea how I can end up connecting those time stamps so I can get this:
C= [ 1 2 3 4 5 6 7 8 9 10 ; 435 124 525 342 532 533 213 988 999 777]'
I want to return all the data in A and B without repeating the data common to both A and B (not just simple concatinating)
Thanks in advance

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采纳的回答

Guillaume
Guillaume 2018-2-17
编辑：Guillaume 2018-2-17
C = union(A, B, 'rows');
Note that your example is neither a timeseries nor a table. Be careful with the terms you use to avoid confusion.
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Guillaume
Guillaume 2018-2-17
No, you were perfectly clear. My brain wasn't engaged properly. I meant to use union instead of intersect.
Fixed now.

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更多回答（1 个）

Peter Perkins
Peter Perkins 2018-2-17
If you are using R2016b or later, you may find that using timetables is convenient. For example, union works the same way as what Guillaume showed ...
>> A = timetable(seconds([1 2 3 4 5 6 7]'), [435 124 525 342 532 533 213]')
A =
7×1 timetable
Time Var1
_____ ____
1 sec 435
2 sec 124
3 sec 525
4 sec 342
5 sec 532
6 sec 533
7 sec 213
>> B = timetable(seconds([5 6 7 8 9 10]'),[532 533 213 988 999 777]')
B =
6×1 timetable
Time Var1
______ ____
5 sec 532
6 sec 533
7 sec 213
8 sec 988
9 sec 999
10 sec 777
>> union(A,B)
ans =
10×1 timetable
Time Var1
______ ____
1 sec 435
2 sec 124
3 sec 525
4 sec 342
5 sec 532
6 sec 533
7 sec 213
8 sec 988
9 sec 999
10 sec 777
but timetables also bring along a lot of other functionality around "combining data".

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