How to perform calculations on common elements of an array

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harshpurohit11
harshpurohit11 2018-6-20
评论： harshpurohit11 2018-6-21
I have A_names =[a,a,a,b,b,c,c,c,c]; B_values = [1,2,3,2,2,3,4,4,4]; length(A_names) = length(B_values). I need to find average of B_values for the common elements of A_names

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Image Analyst
Image Analyst 2018-6-20
If you have the Statistics and Machine Learning Toolbox, use grpstats() - that's what it's meant for - to get statistics by group.
A_names = {'a';'a';'a';'b';'b';'c';'c';'c';'c'}
B_values = [1,2,3,2,2,3,4,4,4]
t = table(A_names, B_values')
output = grpstats(t, 1)

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Adam Danz
Adam Danz 2018-6-20
You can loop through unique values of A_names. Here's a hint to get you started.
A_names ={'a','a','a','b','b','c','c','c','c'};
unqA = unique(A_names);
m = mean(B_values(strcmp(A_names,unqA{1})));

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