Sum and Sort Values from Multiple Vectors

Question

Patrick Rungrugeecharoen 2019-5-26

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链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/464039-sum-and-sort-values-from-multiple-vectors

评论： Patrick Rungrugeecharoen 2019-5-26

采纳的回答： KSSV

I have a numerical vector:

Time = [10 23 54 50]

This corresponds to the string vector:

Place = [A B C A]

And another string vector:

Unique = [A B C]

How do I count these so that I get the following result:

x = [60 23 54]

This is just a snippet of the actual data - the full data set is at least 5000 long. I figured an if loop would work but I'm having trouble visualising and writing the code out.

Any help would be much appreciated. Thanks :)

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per isakson 2019-5-26

编辑：per isakson 2019-5-26

A B C are they names of variables or what?

Patrick Rungrugeecharoen 2019-5-26

They're variables yes in the form of strings.

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Answer 1

KSSV 2019-5-26

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/464039-sum-and-sort-values-from-multiple-vectors#answer_376647

在 MATLAB Online 中打开

Time = [10 23 54 50]
place = {'A' 'B' 'C' 'A'}
place_unique = unique(place)
N = length(place_unique) ; 
iwant = zeros(N,1) ; 
for i = 1:N
    iwant(i) = sum(Time(strcmp(place,place_unique{i}))) ;
end
iwant