Campus Livre
~
Logical NOT operator.
Category: Language Fundamentals > Operators and Elementary Operations
Syntax
B = ~AReturns 1 where A is zero and 0 where it is nonzero. Same as not(A).
Description
~ inverts a mask: if m = x > 3 marks the large values, x(~m) selects the others. It binds more tightly than comparison and arithmetic operators, so ~x == y means (~x) == y, which is rarely what is wanted; write ~(x == y) or use x ~= y.
The same symbol, placed in an output list, as in [~, i] = max(x), tells MATLAB to ignore that output.
Input arguments
A- Numeric or logical array.
Output arguments
B- Logical array of the same size as
A.
Example
x = [1 5 3 8];
m = x > 3
~m
x(~m)
[~, i] = max(x)Output
m = 1×4 logical array
0 1 0 1
ans = 1×4 logical array
1 0 1 0
ans = 1×2
1 3
i = 4