The "FilterZero" filter function accepts a set of Streams and returns a subset of those Streams for which each stream has at least one non-zero data point.

The following streams definition shows the use of the FilterZero filter function to return only those coverage streams that have a non-zero value.

streams NonZeroWorkspaceCoverageStreams() = {
  "NonZero workspace coverage",
  FilterZero(WorkspaceCoverage("Percentage", "**", "line"))
};