How to delete an empty matrix ?

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Matlab111
Matlab111 2015-2-1
评论： Image Analyst 2015-2-1
i want delete an empty matrix in this code, after running this code you will get an empty matrix...
a=[ 30.4596 37.6811 93.0000
154.6678 172.8173 91.0000
44.7308 175.6077 94.0000
90.8282 191.0239 91.0000
149.5394 149.1930 70.0000];
b= [9.0000];
tolerance = 0.00001;
% Subtract third columns
matches = abs(a(:,3) - b) < tolerance
% Extract matching rows.
c = a(matches, :);
now i want to delete this "Empty matrix: 0-by-3", how to delete it.

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采纳的回答

per isakson
per isakson 2015-2-1
Try
clear a

更多回答（1 个）

Image Analyst
Image Analyst 2015-2-1
I already showed you how to do it with clear('c') in your duplicate post http://www.mathworks.com/matlabcentral/answers/174121-how-to-compare-different-matrix#comment_263635 - no reason to post the question again. I also said that I don't think it's a good idea because when you later go to check it, it will throw an exception if you had deleted it. If you bail out of the function if it's empty, then that's fine but if you're doing that then there's no reason to delete it at all.
  1 个评论
Matlab111
Matlab111 2015-2-1
编辑：Matlab111 2015-2-1
ya sorry for that i won't repeat it again sir.. but thank a lot and you helped me a lot, sir...

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