dual_vector-access: Indexing and length for dual_vector

In nabla: Exact Derivatives via Automatic Differentiation

Indexing and length for dual_vector

Description

Indexing and length for dual_vector

Usage

## S4 method for signature 'dual_vector,numeric'
x[i, j, ..., drop = TRUE]

## S4 method for signature 'dual_vector'
length(x)

Arguments

x	A dual_vector.
i	Numeric index.
j, drop, ...	Ignored (present for generic compatibility).

Value

A single dual for scalar index; a dual_vector for vector index; an integer for length.

Examples

dv <- dual_vector(dual(10, 1), dual(20, 0), dual(30, 0))
value(dv[1])
length(dv)

nabla documentation built on Feb. 11, 2026, 1:06 a.m.