The Log class.
This class represents the elementwise natural logarithm \log(x).
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)
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. |
to_numeric: The elementwise natural logarithm of the input value.
sign_from_args: The sign of the atom is unknown.
is_atom_convex: The atom is not convex.
is_atom_concave: The atom is concave.
is_atom_log_log_convex: Is the atom log-log convex?
is_atom_log_log_concave: Is the atom log-log concave?
is_incr: The atom is weakly increasing.
is_decr: The atom is not weakly decreasing.
.grad: Gives the (sub/super)gradient of the atom w.r.t. each variable
.domain: Returns constraints describng the domain of the node
xAn Expression or numeric constant.
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