What does a "~" mean in the following code

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Andreas
Andreas 2011-1-20
回答： Luna 2024-4-18，6:25
A newbie (me) needs to understand a syntax I can't find in the documentation.
if ~isempty(E)
B=[A
E'*S];
end;
What does the ~ (tilde) mean or do prior to the isempty(E)?
  2 个评论
Todd Flanagan
Todd Flanagan 2011-1-20
Andreas say, "I found it. ~ indicates not.
Thx anyway"
Todd Flanagan
Todd Flanagan 2011-1-20
Hi Andreas, I moved your answer into a comment on your original question.

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采纳的回答

Kenneth Eaton
Kenneth Eaton 2011-1-20
This is the logical NOT operator, so ~isempty(E) will evaluate to true when E is not empty.

更多回答（2 个）

Doug Hull
Doug Hull 2011-1-20
~ means 'not'
DOC link
doc punct
At the command line will tell you other uses for ~ and the punctuation marks.
Luna
Luna 2024-4-18，6:25
  1. For what values of the variable a will the following code print 'Goodbye Mapua'?
  3. if a < 7 || a >= 4
  4. disp('Hello Mapua ')
  5. else
  6. disp('Goodbye Mapua ')
  7. end

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