Groups [x, value, name] rows into aligned streams: names in order of first appearance, x =
the sorted union (a stream without a row at some x is 0 there), rows sharing x and name are
summed. Values must be finite and >= 0 (a stream is a magnitude); x finite.
Groups
[x, value, name]rows into aligned streams: names in order of first appearance, x = the sorted union (a stream without a row at some x is 0 there), rows sharing x and name are summed. Values must be finite and >= 0 (a stream is a magnitude); x finite.