Compare multiple columns in a cell array with strcmp
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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 个评论
Stephen23
2016-2-2
I don't see that doing this on one line will be clearer code though. Why not just leave it as it is? Code that is easier to understand has fewer mistakes, and is much easier to maintain.
Guillaume
2016-2-2
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.
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, :);
采纳的回答
Guillaume
2016-2-2
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.
更多回答（1 个）
Walter Roberson
2016-2-2
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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