How to make a list of appearance
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Hi guys,
I am having some lists of animal which some animal appear many time in many list. So I want to count the appearance of animal and show how many times it appear, then save it to excel file
the data after saving in excel shoulbe be like this
name , count
a 1
b 3
c 2
I have think about 2d- char array but it seems Matlab does not support it.
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採用された回答
Ameer Hamza
2020 年 9 月 25 日
編集済み: Ameer Hamza
2020 年 9 月 25 日
Use findgrpups() and histcounts(). Something like this
names = ["cat" "dog" "cat" "cat" "dog"];
[n, unique_names] = findgroups(names);
freq = accumarray(n(:), 1);
T = table(unique_names(:), freq(:));
Result
>> T
T =
2×2 table
Var1 Var2
_____ ____
"cat" 3
"dog" 2
Write to excel file
writetable(T, 'filename.xlsx')
In R2019a and later, following will also work
names = ["cat" "dog" "cat" "cat" "dog"];
[freq, unique_names] = groupcounts(names(:));
T = table(unique_names(:), freq(:));
6 件のコメント
その他の回答 (2 件)
KSSV
2020 年 9 月 25 日
Let str be your list of animals.
xbins = unique(str);
[counts,centres] = hist(str,xbins);
R = [centres counts']
0 件のコメント
Steven Lord
2020 年 9 月 25 日
histcounts and histogram can handle categorical arrays.
names = ["cat" "dog" "cat" "cat" "dog"];
animals = categorical(names);
[counts, types] = histcounts(animals);
results = table(types.', counts.', 'VariableNames', ["animal", "population"])
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