Atom-class {CVXR}

The Atom class.

Description

This virtual class represents atomic expressions in CVXR.

Usage

## S4 method for signature 'Atom'
name(x)

## S4 method for signature 'Atom'
validate_args(object)

## S4 method for signature 'Atom'
dim(x)

## S4 method for signature 'Atom'
nrow(x)

## S4 method for signature 'Atom'
ncol(x)

## S4 method for signature 'Atom'
allow_complex(object)

## S4 method for signature 'Atom'
is_nonneg(object)

## S4 method for signature 'Atom'
is_nonpos(object)

## S4 method for signature 'Atom'
is_imag(object)

## S4 method for signature 'Atom'
is_complex(object)

## S4 method for signature 'Atom'
is_convex(object)

## S4 method for signature 'Atom'
is_concave(object)

## S4 method for signature 'Atom'
is_log_log_convex(object)

## S4 method for signature 'Atom'
is_log_log_concave(object)

## S4 method for signature 'Atom'
canonicalize(object)

## S4 method for signature 'Atom'
graph_implementation(object, arg_objs, dim, data = NA_real_)

## S4 method for signature 'Atom'
value_impl(object)

## S4 method for signature 'Atom'
value(object)

## S4 method for signature 'Atom'
grad(object)

## S4 method for signature 'Atom'
domain(object)

## S4 method for signature 'Atom'
atoms(object)

Arguments

x, object

An Atom object.

arg_objs

A list of linear expressions for each argument.

dim

A vector with two elements representing the dimensions of the resulting expression.

data

A list of additional data required by the atom.

Methods (by generic)

• name(Atom): Returns the string representtation of the function call

• validate_args(Atom): Raises an error if the arguments are invalid.

• dim(Atom): The c(row, col) dimensions of the atom.

• nrow(Atom): The number of rows in the atom.

• ncol(Atom): The number of columns in the atom.

• allow_complex(Atom): Does the atom handle complex numbers?

• is_nonneg(Atom): A logical value indicating whether the atom is nonnegative.

• is_nonpos(Atom): A logical value indicating whether the atom is nonpositive.

• is_imag(Atom): A logical value indicating whether the atom is imaginary.

• is_complex(Atom): A logical value indicating whether the atom is complex valued.

• is_convex(Atom): A logical value indicating whether the atom is convex.

• is_concave(Atom): A logical value indicating whether the atom is concave.

• is_log_log_convex(Atom): A logical value indicating whether the atom is log-log convex.

• is_log_log_concave(Atom): A logical value indicating whether the atom is log-log concave.

• canonicalize(Atom): Represent the atom as an affine objective and conic constraints.

• graph_implementation(Atom): The graph implementation of the atom.

• value_impl(Atom): Returns the value of each of the componets in an Atom. Returns an empty matrix if it's an empty atom

• value(Atom): Returns the value of the atom.

• grad(Atom): The (sub/super)-gradient of the atom with respect to each variable.

• domain(Atom): A list of constraints describing the closure of the region where the expression is finite.

• atoms(Atom): Returns a list of the atom types present amongst this atom's arguments