How to perform calculations on common elements of an array

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

Answer 1

[Image Analyst]

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)

[harshpurohit11]

Thank you so much. This is exactly what I was looking for

Answer 2

[Adam Danz]

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})));

[harshpurohit11]

Thanks Adam