Arithmetic operators on a measure A
are only defined
in some cases. The arithmetic operator is effectively applied
to the value of A(W)
for every spatial domain W
.
If the result is a measure, then this operation is valid.
If A
is a measure (object of class "msr"
)
then the operations -A
and +A
are defined.
If A
and B
are measures,
then A + B
and A - B
are defined.
(This is implemented only when A
and B
are represented using the same quadrature scheme.)
If A
is a measure and z
is a numeric value,
then A * z
and A / z
are defined,
and z * A
is defined.