isscalar

Determine whether input is scalar

Syntax

TF = isscalar(A)

Description

TF= isscalar(A)returns logical1(true) ifAis a scalar. Otherwise, it returns logical0(false). A scalar is a two-dimensional array that has a size of 1-by-1.

Examples

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Determine Scalar from Matrix

Open Live Script

Create a 2-by-2 matrix. Determine whether it is a scalar.

A = [1 2; 3 4]; TF = isscalar(A)

TF =logical0

Check whether the element at the first row and second column of the matrix is a scalar.

TF = isscalar(A(1,2))

TF =logical1

String Scalar and Character Vector

Open Live Script

Create a string scalar by enclosing a piece of text in double quotes. Determine whether it is a scalar.

A ="Hello, World!"; TF = isscalar(A)

TF =logical1

Now create a character vector by enclosing a piece of text in single quotes. Determine whether it is a scalar.

B ='Hello, World!'; TF = isscalar(B)

TF =logical0

Check the dimension ofBusingsize.Bis not a scalar since it has a size of 1-by-13.

sz = size(B)

sz =1×21 13

Input Arguments

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`A`—Input array
scalar|vector|matrix|multidimensional array

Input array, specified as a scalar, vector, matrix, or multidimensional array.

Extended Capabilities

Tall Arrays
Calculate with arrays that have more rows than fit in memory.

This function fully supports tall arrays. For more information, seeTall Arrays.

C/C++ Code Generation
Generate C and C++ code using MATLAB® Coder™.

HDL Code Generation
Generate Verilog and VHDL 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, seeRun MATLAB Functions in Thread-Based Environment.

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, seeRun MATLAB Functions with Distributed Arrays(Parallel Computing Toolbox).

MATLAB Documentation

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