AffAtom-class function

The AffAtom class.

This virtual class represents an affine atomic expression. class

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

## S4 method for signature 'AffAtom'
sign_from_args(object)

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

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

## S4 method for signature 'AffAtom'
is_atom_convex(object)

## S4 method for signature 'AffAtom'
is_atom_concave(object)

## S4 method for signature 'AffAtom'
is_incr(object, idx)

## S4 method for signature 'AffAtom'
is_decr(object, idx)

## S4 method for signature 'AffAtom'
is_quadratic(object)

## S4 method for signature 'AffAtom'
is_qpwa(object)

## S4 method for signature 'AffAtom'
is_pwl(object)

## S4 method for signature 'AffAtom'
is_psd(object)

## S4 method for signature 'AffAtom'
is_nsd(object)

## S4 method for signature 'AffAtom'
.grad(object, values)

Arguments

• object: An AffAtom object.
• idx: An index into the atom.
• values: A list of numeric values for the arguments

Methods (by generic)

• allow_complex(AffAtom): Does the atom handle complex numbers?
• sign_from_args(AffAtom): The sign of the atom.
• is_imag(AffAtom): Is the atom imaginary?
• is_complex(AffAtom): Is the atom complex valued?
• is_atom_convex(AffAtom): The atom is convex.
• is_atom_concave(AffAtom): The atom is concave.
• is_incr(AffAtom): The atom is weakly increasing in every argument.
• is_decr(AffAtom): The atom is not weakly decreasing in any argument.
• is_quadratic(AffAtom): Is every argument quadratic?
• is_qpwa(AffAtom): Is every argument quadratic of piecewise affine?
• is_pwl(AffAtom): Is every argument piecewise linear?
• is_psd(AffAtom): Is the atom a positive semidefinite matrix?
• is_nsd(AffAtom): Is the atom a negative semidefinite matrix?
• .grad(AffAtom): Gives the (sub/super)gradient of the atom w.r.t. each variable