assign Independent Stream Advances
Assigns non-overlapping pre-run sub-stream advances to the selected scenarios.
The assignments are written to each scenario's ExperimentRunParameters.numberOfStreamAdvancesPriorToRunning field. With the default streamAdvanceSpacing of null, each selected scenario receives the next cumulative offset based on the previous selected scenario's number of replications. For example, three selected scenarios with 3, 5, and 2 replications receive offsets 0, 3, and 8.
If streamAdvanceSpacing is supplied, the same fixed spacing is used between selected scenarios. This is useful when callers want stable offsets even if scenario replication counts later change.
Invalid indices in scenarios are ignored. Assignment follows the order of the supplied progression, so a descending progression assigns offsets in descending index order.
Return
this list for fluent configuration
Parameters
indices of scenarios to assign; defaults to the full list
first assigned advance value; must be >= 0
fixed spacing between selected scenarios; null uses cumulative replication counts