What does a "~" mean in the following code

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)?

[Todd Flanagan]

Andreas say, "I found it. ~ indicates not.

Thx anyway"

[Todd Flanagan]

Hi Andreas, I moved your answer into a comment on your original question.

Answer 1

[Kenneth Eaton]

This is the logical NOT operator, so ~isempty(E) will evaluate to true when E is not empty.

Answer 2

[Doug Hull]

~ means 'not'

DOC link

doc punct

At the command line will tell you other uses for ~ and the punctuation marks.

Answer 3

[Luna]

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