Compare multiple columns in a cell array with strcmp

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Dave
Dave le 2 Fév 2016
Modifié(e) : Stephen23 le 2 Fév 2016
I have an m x n cell array. I would like to pull specific rows that match strings from different columns. Currently, I'm accomplishing this with two matlab lines as follows:
hill_log = runlog1(strcmp(runlog1(:,4), 'Hill'),:);
hill_log2 = hill_log(strcmp(hill_log(:,6), 'Kilometer'),:):
I'd like to be able to do this on one line with one strcmp, possible?
Thanks Dave
  3 commentaires
Guillaume
Guillaume le 2 Fév 2016
What will make the code 100% clearer is a comment that states the intent.
Otherwise, I do believe that a one-liner using logical operations express the intent better that you want all runlog1 where column 4 is Hill AND column 6 is Kilometer.
Stephen23
Stephen23 le 2 Fév 2016
Modifié(e) : Stephen23 le 2 Fév 2016
It is all a matter of taste of course, I would do something like this:
ishi = strcmp(runlog1(:,4), 'Hill');
iskm = strcmp(runlog1(:,6), 'Kilometer'):
hill_log2 = runlog1(ishi & iskm, :);

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Guillaume
Guillaume le 2 Fév 2016
Hum, why not use logical operations?
hill_log2 = runlog1(strcmp(runlog1(:,4), 'Hill') & strcmp(hill_log(:,6), 'Kilometer'), :);
In my opinion, it expresses the intent better than concatenating strings with a special character.

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Walter Roberson
Walter Roberson le 2 Fév 2016
hill_log2 = runlog1( ismember( strcat(runlog1(:,4), char(65535), runlog1(:,6)), ['Hill' char(65535) 'Kilometer']), :);
You could use strcmp() instead of ismember() if you prefer.
char(65535) can be any character that you are sure does not appear in the columns. Except maybe char(0), that one is touchy, some of the routines malfunction on char(0)

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