Log-class function

The Log class.

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

Log(x)

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

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

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

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

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

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

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

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

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

## S4 method for signature '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.