dnorm: Normal distribution

In salad: Simple Automatic Differentiation

Normal distribution

Description

Density for the normal distribution, accepting objects of class 'dual'

Usage

dnorm(x, mean = 0, sd = 1, log = FALSE)

dnorm.dual(x, mean = 0, sd = 1, log = FALSE)

Arguments

x	vector of values
mean	vector of means
sd	vector of standard deviations
log	logical. If TRUE, log of densities are returned

Details

'dnorm.dual' will make straightfoward a computation (in R), that works both with numeric or dual objects. 'dnorm' will call 'dnorm.dual' if any of the objects is of class dual, or 'stats::dnorm' is all objects are of class numeric. As 'stats::dnorm' is in written in C it is factor.

If you care for performance, use 'stats::dnorm' directly for non dual numbers, and 'dnorm.dual' for dual numbers.

Value

a dual object.

Examples

x <- dual(0)
dnx <- dnorm(x)
dnx
d(dnx)

salad documentation built on April 4, 2025, 1:06 a.m.