LoguniformDistribution

Loguniform probability distribution object

Since R2021b

Description

A LoguniformDistribution object consists of parameters and a model description for a loguniform probability distribution, also referred to as a reciprocal distribution.

The loguniform distribution is a continuous distribution. Its density function is proportional to the reciprocal of the variable value within the support of the distribution (lower and upper limits).

The loguniform distribution uses the following parameters.

Parameter	Description	Support
Lower	Lower parameter	$$0<\text{Lower}<\text{Upper}$$
Upper	Upper parameter	$$\text{Lower}<\text{Upper}<\infty$$

Creation

Create a LogUniformDistribution probability distribution object with specified parameter values by using makedist.

Properties

Distribution Parameters

Lower — Lower limit

scalar value

Lower limit of the support of the loguniform distribution, specified as a scalar value.

Data Types: single | double

Upper — Upper limit

scalar value

Upper limit of the support of the loguniform distribution, specified as a scalar value greater than Lower.

Data Types: single | double

Distribution Characteristics

IsTruncated — Logical flag for truncated distribution

0 | 1

This property is read-only.

Logical flag for truncated distribution, specified as a logical value. If IsTruncated equals 0, the distribution is not truncated. If IsTruncated equals 1, the distribution is truncated.

Data Types: logical

NumParameters — Number of parameters

positive integer value

This property is read-only.

Number of parameters for the probability distribution, specified as a positive integer value.

Data Types: double

ParameterValues — Distribution parameter values

vector of scalar values

This property is read-only.

Distribution parameter values, specified as a vector of scalar values.

Data Types: single | double

Truncation — Truncation interval

vector of scalar values

This property is read-only.

Truncation interval for the probability distribution, specified as a vector of scalar values containing the lower and upper truncation boundaries.

Data Types: single | double

Other Object Properties

DistributionName — Probability distribution name

character vector

This property is read-only.

Probability distribution name, specified as a character vector.

Data Types: char

ParameterDescription — Distribution parameter descriptions

cell array of character vectors

This property is read-only.

Distribution parameter descriptions, specified as a cell array of character vectors. Each cell contains a short description of one distribution parameter.

Data Types: char

ParameterNames — Distribution parameter names

cell array of character vectors

This property is read-only.

Distribution parameter names, specified as a cell array of character vectors.

Data Types: char

Object Functions

cdf	Cumulative distribution function
icdf	Inverse cumulative distribution function
iqr	Interquartile range of probability distribution
mean	Mean of probability distribution
median	Median of probability distribution
pdf	Probability density function
plot	Plot probability distribution object
random	Random numbers
std	Standard deviation of probability distribution
truncate	Truncate probability distribution object
var	Variance of probability distribution

Examples

Create Loguniform Distribution Object Using Default Parameters

Create a loguniform distribution object using the default parameter values.

pd = makedist('Loguniform')

pd = 
  LoguniformDistribution

  Loguniform distribution
    Lower = 1
    Upper = 4

Create Loguniform Distribution Object Using Specified Parameters

Create uniform distribution object by specifying parameter values.

pd = makedist('Loguniform','Lower',2,'Upper',6)

pd = 
  LoguniformDistribution

  Loguniform distribution
    Lower = 2
    Upper = 6

Version History

Introduced in R2021b