Operator Type:
Operator Scope of Action:
Operator Purpose:
Operator First Added:
Operator Altered:
Function [other Function type actions]
Group [operators of similar scope]
Mathematical [other Mathematical operators]
Already in v5.0.0
sum(group,value)
This computes the arithmetic sum of every value in a group. See sum_if() for a related conditional operator.
group may be any of {children,descendants,siblings,ancestors,all}.
In addition, group may be argument that designates a particular (single) note other than this.
value can be any expression, but is typically an attribute value.
For example,
sum(children,$WordCount)
constructs the current word count of the children of the note.