# Cauchy-class

From distr v2.6
0th

Percentile

##### Class "Cauchy"

The Cauchy distribution with location $l$, by default $=0$, and scale $s$ , by default $=1$,has density $$f(x) = \frac{1}{\pi s} \left( 1 + \left(\frac{x - l}{s}\right)^2 \right)^{-1}%$$ for all $x$. C.f. rcauchy

Keywords
distribution
##### Objects from the Class

Objects can be created by calls of the form Cauchy(location, scale). This object is a Cauchy distribution.

##### Slots

img
Object of class "Reals": The domain of this distribution has got dimension 1 and the name "Real Space".
param
Object of class "CauchyParameter": the parameter of this distribution (location and scale), declared at its instantiation
r
Object of class "function": generates random numbers (calls function rcauchy)
d
Object of class "function": density function (calls function dcauchy)
p
Object of class "function": cumulative function (calls function pcauchy)
q
Object of class "function": inverse of the cumulative function (calls function qcauchy)
.withArith
logical: used internally to issue warnings as to interpretation of arithmetics
.withSim
logical: used internally to issue warnings as to accuracy
.logExact
logical: used internally to flag the case where there are explicit formulae for the log version of density, cdf, and quantile function
.lowerExact
logical: used internally to flag the case where there are explicit formulae for the lower tail version of cdf and quantile function
Symmetry
object of class "DistributionSymmetry"; used internally to avoid unnecessary calculations.

##### Extends

Class "AbscontDistribution", directly. Class "UnivariateDistribution", by class "AbscontDistribution". Class "Distribution", by class "AbscontDistribution".

##### Is-Relations

By means of setIs, R knows'' that a distribution object obj of class "Cauchy" with location 0 and scale 1 also is a T distribution with parameters df = 1, ncp = 0.

##### Methods

initialize
signature(.Object = "Cauchy"): initialize method
location
signature(object = "Cauchy"): returns the slot location of the parameter of the distribution
location<-
signature(object = "Cauchy"): modifies the slot location of the parameter of the distribution
scale
signature(object = "Cauchy"): returns the slot scale of the parameter of the distribution
scale<-
signature(object = "Cauchy"): modifies the slot scale of the parameter of the distribution
+
signature(e1 = "Cauchy", e2 = "Cauchy"): For the Cauchy distribution the exact convolution formula is implemented thereby improving the general numerical approximation.
*
signature(e1 = "Cauchy", e2 = "numeric")
+
signature(e1 = "Cauchy", e2 = "numeric"): For the Cauchy location scale family we use its closedness under affine linear transformations.
further arithmetic methods see operators-methods

CauchyParameter-class AbscontDistribution-class Reals-class rcauchy

##### Aliases
• Cauchy-class
• Cauchy
• initialize,Cauchy-method
##### Examples
C <- Cauchy(location = 1, scale = 1) # C is a Cauchy distribution with location=1 and scale=1.
r(C)(1) # one random number generated from this distribution, e.g. 4.104603
d(C)(1) # Density of this distribution is 0.3183099 for x=1.
p(C)(1) # Probability that x<1 is 0.5.
q(C)(.1) # Probability that x<-2.077684 is 0.1.
location(C) # location of this distribution is 1.
location(C) <- 2 # location of this distribution is now 2.
is(C,"Td") # no
C0 <- Cauchy() # standard, i.e. location = 0, scale = 1
is(C0,"Td") # yes
as(C0,"Td")

Documentation reproduced from package distr, version 2.6, License: LGPL-3

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