A variable series has Propagate flag allowing to create a separate data sub-series for every record found in the source variable. Here is how it affects series processing.
Propagation Disabled
This is a default setting. Only one data series will be created, even if the source variable has multiple rows. Series Name expression and data Expression will be evaluated having row number zero as default row. It's of course possible to refer other rows using references of format {field[row]}.
Propagation Enabled
A separate sub-series is created for every row found in the current value of series variable.
Series Name should be an expression. This expression is evaluated for every row found in the current value of series variable (i.e. default row is current row).
The current row is also defined as the "active" row for the sub-series, so that when series primary Expression will be evaluated for historical and future values, its default row will be the same.
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Series propagation will work properly only in two cases:
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If series Name expression was evaluated to NULL, no series will be created for the current record. This is very convenient to skip some series. Here is an example of propagated series' Name expression that skips series creation for records those {ifInOctets} and {ifOutOcters} fields are both zeros: ({ifInOctets} > 0 && {ifOutOctets} > 0) ? 'Interface ' + {ifDescr} + ' incoming traffic, Kbit/s' : null |
