In table, how to count a number of specific values by year?
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I have a following table.
Date Value win_repeat
___________ _____ __________
20-Nov-2018 0.041 1
21-Nov-2018 0.04 2
29-Nov-2018 0.042 0
11-Feb-2019 0.039 0
21-Mar-2019 0.035 1
02-May-2019 0.048 0
21-Aug-2019 0.045 2
16-Sep-2019 0.04 0
03-Oct-2019 0.038 2
04-Oct-2019 0.037 1
10-Oct-2019 0.035 0
31-Oct-2019 0.034 2
20-Nov-2019 0.034 1
26-Nov-2019 0.034 1
28-Nov-2019 0.033 1
02-Dec-2019 0.033 2
14-Jan-2020 0.034 2
22-Jun-2020 0.022 1
30-Jul-2020 0.023 2
20-Aug-2020 0.03 0
I like to count how many '0', '1', '2' are in the 'win_repeat' column for each year. The expected result is as below.
year_Date win_repeat GroupCount_win_repeat
2018 0 1
2018 1 1
2018 2 1
2019 0 4
2019 1 5
2019 2 4
2020 0 1
2020 1 1
2020 2 2
Firstly, I tried with 'groupcounts', but it only counts a number of rows in the table for each year.
x = groupcounts(T, 'Date', 'year')
x =
3×3 table
year_Date GroupCount Percent
_________ __________ _______
2018 3 15
2019 13 65
2020 4 20
Next, I tried with 'groupsummary', I cannot intput 'count' for the 'method' variable (please note that 'mean' is input for the 'method' varialbe in the follwing example).
x = groupsummary(T, 'Date', 'year', 'mean', 'win_repeat')
x =
3×3 table
year_Date GroupCount mean_win_repeat
_________ __________ _______________
2018 3 1
2019 13 1
2020 4 1.25
Please help with this. Thank you very much in advance.
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채택된 답변
Cris LaPierre
2021년 6월 30일
편집: Cris LaPierre
2021년 6월 30일
The key may be in realizing that you have 2 grouping criteria - year and win_repeat. I added your data to a txt file so I could run this example.
T = readtable("DoheonLeeTable.txt")
% Use groupsummary
x = groupsummary(T, ["Date","win_repeat"],["year","none"])
% Or use groupcounts
y = groupcounts(T, ["Date","win_repeat"],["year","none"])
댓글 수: 3
Cris LaPierre
2021년 6월 30일
편집: Cris LaPierre
2021년 6월 30일
Correct. You didn't mention needing to apply any function to the groups. This is what the 'method' input is for. You can use one of the predefined methods, or you can call a function you create (example here).
If you don't specify a datavars input, then the method(s) is/are applied to all table variables. Otherwise, it/they are only applied to the indicated variables. Use the same syntax shown for grouping multiple variables to apply multiple methods and to select multiple datavars.
추가 답변 (1개)
Yazan
2021년 6월 30일
year = [repmat(2018, [3,1]); repmat(2019, [13,1]); repmat(2020, [4,1])];
win = [1;2;0;0;1;0;2;0;2;1;0;2;1;1;1;2;2;1;2;0];
T = table(year, win);
groupsummary(T, 'year', @(x) {histcounts(x)});
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