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find duplicate values using accumarray() function:

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Nadir Adam
Nadir Adam 2018-4-19
评论： Nadir Adam 2018-4-23

I have data that contains longitude,latitude,access point address and signal level. I would like to find duplicate longitude,latitude,access point address, then average the signal level over them, and then replacing the original rows with the new single row. How to do this?

For example (made up data):

Starting data:

if true
33.121,-70.630,aa:91:52:9c:72:21,-80
33.122,-70.631,bb:91:52:9c:72:21,-75
33.123,-70.632,cc:91:52:9c:72:21,-84
33.124,-70.633,dd:91:52:9c:72:21,-57
33.121,-70.630,aa:91:52:9c:72:21,-84
33.122,-70.631,bb:91:52:9c:72:21,-73
end

Would become

if true
33.121,-70.630,aa:91:52:9c:72:21,-82
33.122,-70.631,bb:91:52:9c:72:21,-74
33.123,-70.632,cc:91:52:9c:72:21,-84
33.124,-70.633,dd:91:52:9c:72:21,-57
end
  1 个评论
the cyclist
the cyclist 2018-4-19
How are your data currently stored (e.g. what data type)? Can you post the data, or a small sample that has duplicates?

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采纳的回答

Razvan Carbunescu
Razvan Carbunescu 2018-4-19

Using accumarray specifically you could do this by combining with findgroups :

[idx,unique_long,unique_lat,unique_acc] = findgroups(long,lat,acc);
[unique_signal] = accumarray(signal,idx,[],@mean);

In R2018a could also use groupsummary but the data should be in a table:

T = table(long,lat,acc,signal);
GT = groupsummary(T,{'long','lat','acc'},'mean','signal')

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