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Delete duplicate rows from large cell array

Asked by mashtine on 26 Feb 2014
Latest activity Commented on by Aurelien Queffurust on 29 Aug 2014
I have a cell array of the structure 1 x 35 then 1 x 8. This hold data for 35 years and the 8 columns of the 1 x 8 array hold data in various formats eg:
'2000-01-10 1:00' 'HCM' '268' '20' '260' '2345' '0' '90'
However, the data has come with duplicates like this:
'2000-01-10 1:00' 'HCM' '268' '20' '260' '2345' '0' '90'
'2000-01-10 1:00' 'HCM' '268' '20' '260' '2345' '0' '90'
'2000-01-10 2:00' 'HCM' '268' '14' '210' '645' '3' '12'
'2000-01-10 2:00' 'HCM' '268' '14' '210' '645' '3' '12'
'2000-01-10 3:00' 'HCM' '268' '02' '230' '345' '2' '40'
'2000-01-10 3:00' 'HCM' '268' '02' '230' '345' '2' '40'
As chronological order is very important, I would like to remove corresponding duplicate rows (based on the first time col, if my file was name X, the time col would be X{1,1}{1,1}) from each array without changing the order to get something like this:
'2000-01-10 1:00' 'HCM' '268' '20' '260' '2345' '0' '90'
'2000-01-10 2:00' 'HCM' '268' '14' '210' '645' '3' '12'
'2000-01-10 3:00' 'HCM' '268' '02' '230' '345' '2' '40'
Big help if you can help me. I have tried many too may options!

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1 Answer

Answer by Azzi Abdelmalek
on 26 Feb 2014
 Accepted Answer

A={'2000-01-10 1:00' 'HCM' '268' '20' '260' '2345' '0' '90'
'2000-01-10 1:00' 'HCM' '268' '20' '260' '2345' '0' '90'
'2000-01-10 2:00' 'HCM' '268' '14' '210' '645' '3' '12'
'2000-01-10 2:00' 'HCM' '268' '14' '210' '645' '3' '12'
'2000-01-10 3:00' 'HCM' '268' '02' '230' '345' '2' '40'
'2000-01-10 3:00' 'HCM' '268' '02' '230' '345' '2' '40'}
[ii,jj]=unique(arrayfun(@(x) strjoin(A(x,:)),(1:size(A,1))','un',0))
out=A(jj,:)

  8 Comments

Maybe this can help. I have my HWData as a 1x2 for testing but its is usually a 1x35
I am also getting this error with the code:
??? Undefined function or method 'strjoin' for input arguments of type 'cell'.
Error in ==> @(x)strjoin(A{x,:})
Perhaps my version is too old. Even when I try your code, matlab is giving me a strjoin error.
strjoin requires MATLAB R2014a or above

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