Sort table based on number of occurrences
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Marcus Glover
am 6 Sep. 2021
Kommentiert: Marcus Glover
am 29 Okt. 2022
I have a table that I'd like to sort based on groups of a few of the columns. My table is made up of cells.
>> T=table({'A','B','C','B','B'}',{1,2,3,4,5}',{'Car','Van','Car','Car','Car'}')
T =
5×3 table
Var1 Var2 Var3
_____ _____ _______
{'A'} {[1]} {'Car'}
{'B'} {[2]} {'Van'}
{'C'} {[3]} {'Car'}
{'B'} {[4]} {'Car'}
{'B'} {[5]} {'Car'}
I'd like to sort by the number of occurences of Var1 and Var3, starting with the Var1- so since 'B' occurs 3 times, and 'Car' occurs twice with 'B', then the solution would be:
Var1 Var2 Var3
_____ _____ _______
{'B'} {[4]} {'Car'}
{'B'} {[5]} {'Car'}
{'B'} {[2]} {'Van'}
{'A'} {[1]} {'Car'}
{'C'} {[3]} {'Car'}
Is there someting like accumarray for strings? I tried groupsummary, but it will combine rows- Var2 is not always unique.
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Akzeptierte Antwort
Peter Perkins
am 2 Mär. 2022
This has been unanswered for some time. Maybe this is still helpful.
The main problem here is cell arrays of (repeated) text and numeric. Don't use those unless you have to, and you probably don't.
>> T = table(categorical({'A','B','C','B','B'}'), ...
[1,2,3,4,5]', ...
categorical({'Car','Van','Car','Car','Car'}'));
>> cats1 = categories(T.Var1);
>> [~,order1] = sort(countcats(T.Var1),'descend');
>> T.Var1 = reordercats(T.Var1,cats1(order1));
>> cats3 = categories(T.Var3);
>> [~,order3] = sort(countcats(T.Var3),'descend');
>> T.Var3 = reordercats(T.Var3,cats3(order3));
>> sortrows(T,["Var1" "Var3"])
ans =
5×3 table
Var1 Var2 Var3
____ ____ ____
B 4 Car
B 5 Car
B 2 Van
A 1 Car
C 3 Car
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