how to sum data every year

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Hichem Younsi
Hichem Younsi 2020-2-3
评论： Adam Danz 2020-2-8
hello
i have a 11322x6 double. i have the date in the first column, months and days in the third and the forth. on the fivth and the sixth colum i have the variables. temperature and degre days that i calculeted from temperature. now i need to sum every degre day of every year together , the problem years change the number evey 4 years so how to do it with a function or easy loop. i saw a lot of them on matlab but don't kenw how to use itnd i don't knew to apply it on my case

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Adam Danz
Adam Danz 2020-2-3
编辑：Adam Danz 2020-2-6
No loop needed.
Use findgroups() on the appropriate column(s) to group the rows. Then use
mu = splitapply(@mean, data, groups)
to compute the mean of each group where data is the temperature column.
If your data contain missing values, you can use mu = splitapply(@(x), mean(data,'omitnan'), groups).
Let us know if you get stuck.
  2 个评论
Hichem Younsi
Hichem Younsi 2020-2-5
so i can't apply the findgroups in an array ?
Adam Danz
Adam Danz 2020-2-5
编辑：Adam Danz 2020-2-5
Updated comment
You can't apply findgroups to a matrix but you can find unique rows of a table
[G,TID] = findgroups(T)
or you can separate the columns of your matrix and use this syntax
G = findgroups(A1,...,AN)
Both of those links will show documentation that describes the syntax and provides examples.

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更多回答（1 个）

Hichem Younsi
Hichem Younsi 2020-2-8
oof that worked thank you Adam Danz. i convert the matrix to an table and then i used the findgroups to find how many days in each mounths in years and then i used the splitapply function to sum the variable on folwngs years. GREAT THANK YOU
Adam Danz

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