The Log class.

Source: R/elementwise.R

This class represents the elementwise natural logarithm \(\log(x)\).

Log(x)

# S4 method for class 'Log'
to_numeric(object, values)

# S4 method for class 'Log'
sign_from_args(object)

# S4 method for class 'Log'
is_atom_convex(object)

# S4 method for class 'Log'
is_atom_concave(object)

# S4 method for class 'Log'
is_atom_log_log_convex(object)

# S4 method for class 'Log'
is_atom_log_log_concave(object)

# S4 method for class 'Log'
is_incr(object, idx)

# S4 method for class 'Log'
is_decr(object, idx)

# S4 method for class 'Log'
.grad(object, values)

# S4 method for class 'Log'
.domain(object)

Arguments

x

An Expression or numeric constant.

object

A Log object.

values

A list of numeric values for the arguments

idx

An index into the atom.

Methods (by generic)

  • to_numeric(Log): The elementwise natural logarithm of the input value.

  • sign_from_args(Log): The sign of the atom is unknown.

  • is_atom_convex(Log): The atom is not convex.

  • is_atom_concave(Log): The atom is concave.

  • is_atom_log_log_convex(Log): Is the atom log-log convex?

  • is_atom_log_log_concave(Log): Is the atom log-log concave?

  • is_incr(Log): The atom is weakly increasing.

  • is_decr(Log): The atom is not weakly decreasing.

  • .grad(Log): Gives the (sub/super)gradient of the atom w.r.t. each variable

  • .domain(Log): Returns constraints describng the domain of the node

Slots

x

An Expression or numeric constant.