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- not , ~
- On this page
- Syntax
- Description
- Examples
- Input Arguments
- Tips
- Extended Capabilities
- Version History
- See Also
not , ~
Find logical NOT
Description
~
returns a logical array or a
table of logical values of the same size as
A
A
. The output
contains logical
1
(
true
) values where
A
is zero and logical
0
(
false
) values where
A
is nonzero.
not(
is
an alternate way to execute
A
)
~A
, but is rarely used.
It enables operator overloading for classes.
Examples
Logical Negation of Matrix
Create a 3-by-3 identity matrix.
A = eye(3)
A = 3×3
1 0 0
0 1 0
0 0 1
Find the logical negation of
A
. The new matrix has type
logical
.
B = ~A
B = 3x3 logical array
0 1 1
1 0 1
1 1 0
Conditional Code Execution
Execute code based on a condition using the logical not operator in the context of an
if
loop.
Create a logical variable
A
.
A = false;
Use
A
to write an if/else code block. Wrap the if/else block in a
for
loop so that it executes four times.
for k = 1:4 if ~A disp('IF block') A = true; disp('ELSE block') end
IF block
ELSE block ELSE block ELSE block
On the first iteration,
A
is
false
, so the
if
block executes since
~A
is
true
. However, the
if
block also changes the value of
A
to
true
. In the remaining iterations,
~A
is
false
and the
else
block executes.
Logical NOT of Table
Since R2023a
Create a table and perform a logical NOT of it. To perform a logical NOT of a table or timetable, all its variables must have data types that support logical operations.
A = table([0;2],[0;4],VariableNames=["V1","V2"],RowNames=["R1","R2"])
A=2×2 table
V1 V2
__ __
R1 0 0
R2 2 4
~A
ans=2×2 table
V1 V2
_____ _____
R1 true true
R2 false false
Input Arguments
A
—
Input array
scalar
|
vector
|
matrix
|
multidimensional array
|
table
|
timetable
Input array, specified as a numeric scalar, vector, matrix, multidimensional array, table, or timetable.
Data Types:
single
|
double
|
int8
|
int16
|
int32
|
int64
|
uint8
|
uint16
|
uint32
|
uint64
|
logical
|
char
|
table
|
timetable
Complex Number Support:
Yes
Tips
-
You also can use the
~symbol as a placeholder output argument in a function call. For example,[~,i] = max(A)suppresses the first output of themaxfunction, returning only the indices of the maximum values. For more information, see Ignore Inputs in Function Definitions .
Extended Capabilities
Tall Arrays
Calculate with arrays that have more rows than fit in memory.
This function fully supports tall arrays. For more information, see Tall Arrays .
C/C++ Code Generation
Generate C and C++ code using MATLAB® Coder™.
GPU Code Generation
Generate CUDA® code for NVIDIA® GPUs using GPU Coder™.
HDL Code Generation
Generate VHDL, Verilog and SystemVerilog code for FPGA and ASIC designs using HDL Coder™.
Thread-Based Environment
Run code in the background using MATLAB®
backgroundPool
or accelerate code with Parallel Computing Toolbox™
ThreadPool
.
This function fully supports thread-based environments. For more information, see Run MATLAB Functions in Thread-Based Environment .
GPU Arrays
Accelerate code by running on a graphics processing unit (GPU) using Parallel Computing Toolbox™.
This function fully supports GPU arrays. For more information, see Run MATLAB Functions on a GPU (Parallel Computing Toolbox) .
Distributed Arrays
Partition large arrays across the combined memory of your cluster using Parallel Computing Toolbox™.
This function fully supports distributed arrays. For more information, see Run MATLAB Functions with Distributed Arrays (Parallel Computing Toolbox) .
Version History
Introduced before R2006aR2023a: Perform operations directly on tables and timetables
The
not
operator supports operations directly on tables and
timetables without indexing to access their variables. All variables must have data types
that support the operation. For more information, see
Direct Calculations on Tables and Timetables
.
See Also
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