std2

Standard deviation of matrix elements

Syntax

B = std2(A)

Description

B = std2(A) computes the standard deviation of all values in array A.

Examples

Compute 2-D Standard Deviation

Read a grayscale image into the workspace, then calculate the standard deviation of the pixel intensity values.

I = imread('liftingbody.png');
val = std2(I)

val = 
31.6897

Input Arguments

A — Input data

numeric array | logical array

Input data, specified as a numeric or logical array.

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

Output Arguments

B — Standard deviation

numeric scalar

Standard deviation of input data, returned as a numeric scalar. If the data type of A is single, then the data type of B is also single. Otherwise, the data type of B is double.

Data Types: single | double

Extended Capabilities

C/C++ Code Generation

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

std2 supports the generation of C and C++ code (requires MATLAB^® Coder™). For more information, see Code Generation for Image Processing.

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 Image Processing on a GPU.

Version History

Introduced before R2006a

R2024b: Generate C code using MATLAB Coder

std2 now supports the generation of C code (requires MATLAB Coder).