isprime

Determine which array elements are prime

Syntax

TF = isprime(X)

Description

TF = isprime(X) returns a logical array the same size as X. The value at TF(i) is true when X(i) is a prime number. Otherwise, the value is false.

Examples

Determine if Double Integer Values Are Prime

tf = isprime([2 3 0 6 10])

tf = 1x5 logical array

   1   1   0   0   0

2 and 3 are prime, but 0, 6, and 10 are not.

Determine If Unsigned Integer Values Are Prime

x = uint16([333 71 99]);
tf = isprime(x)

tf = 1x3 logical array

   0   1   0

71 is prime, but 333 and 99 are not.

Input Arguments

X — Input values

scalar, vector, or array of real, nonnegative integer values

Input values, specified as a scalar, vector, or array of real, nonnegative integer values.

Example: 17

Example: [1 2 3 4]

Example: int16([127 255 4095])

Data Types: single | double | int8 | int16 | int32 | int64 | uint8 | uint16 | uint32 | uint64

Extended Capabilities

C/C++ Code Generation

Generate C and C++ code using MATLAB® Coder™.

Usage notes and limitations:

• The maximum double precision input is 2^33.

• The maximum single precision input is 2^25.

• The input X cannot have type int64 or uint64.

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.

Version History

Introduced before R2006a