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Output variable y(t). For each calculation of y(t) the previous output values y(t-1) to y(t-N) are required. When this transformation runs, then it first retrieves the required previous output values from previous runs, if available. If one of these previous output values is missing, then that output value is ignored. Effectively this means that it behaves as if all previous missing output values would be 0.
Configuration
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Examples
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<variable> <variableId>input</variableId> <timeSeriesSet> <moduleInstanceId>FilterLowPassTest</moduleInstanceId> <valueType>scalar</valueType> <parameterId>H.obs</parameterId> <locationId>location1</locationId> <timeSeriesType>external historical</timeSeriesType> <timeStep unit="day"/> <relativeViewPeriod unit="day" start="10" end="43"/> <readWriteMode>editing visible to all future task runs</readWriteMode> </timeSeriesSet> </variable> <variable> <variableId>output</variableId> <timeSeriesSet> <moduleInstanceId>FilterLowPassTest</moduleInstanceId> <valueType>scalar</valueType> <parameterId>H.m</parameterId> <locationId>location1</locationId> <timeSeriesType>external historical</timeSeriesType> <timeStep unit="day"/> <relativeViewPeriod unit="day" start="10" end="43"/> <readWriteMode>add originals</readWriteMode> </timeSeriesSet> </variable> <transformation id="filter low pass"> <filter> <lowPass> <inputVariable> <variableId>input</variableId> </inputVariable> <coefficientSet> <a>0.4</a> <a>0.3</a> <b>0.2</b> <b>0.1</b> </coefficientSet> <outputVariable> <variableId>output</variableId> </outputVariable> </lowPass> </filter> </transformation> |
The example below uses coefficientSetFunctions (available since build 30246). Here the coefficients are defined in coefficientSetFunctions, where @a1@, @a2@, @b0@ and @b1@ refer to location number attributes that are defined in the locationSets configuration file.
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<variable>
<variableId>input</variableId>
<timeSeriesSet>
<moduleInstanceId>FilterLowPassWithCoefficientSetFunctionsTest</moduleInstanceId>
<valueType>scalar</valueType>
<parameterId>H.obs</parameterId>
<locationId>locationWithAttributes5</locationId>
<timeSeriesType>external historical</timeSeriesType>
<timeStep unit="day"/>
<relativeViewPeriod unit="day" start="10" end="43"/>
<readWriteMode>editing visible to all future task runs</readWriteMode>
</timeSeriesSet>
</variable>
<variable>
<variableId>output</variableId>
<timeSeriesSet>
<moduleInstanceId>FilterLowPassWithCoefficientSetFunctionsTest</moduleInstanceId>
<valueType>scalar</valueType>
<parameterId>H.m</parameterId>
<locationId>locationWithAttributes5</locationId>
<timeSeriesType>external historical</timeSeriesType>
<timeStep unit="day"/>
<relativeViewPeriod unit="day" start="10" end="43"/>
<readWriteMode>add originals</readWriteMode>
</timeSeriesSet>
</variable>
<transformation id="filter low pass with coefficient set functions test">
<filter>
<lowPass>
<inputVariable>
<variableId>input</variableId>
</inputVariable>
<coefficientSetFunctions>
<a><at:var at:name="a1" /></a>
<a><at:var at:name="a2" /></a>
<b><at:var at:name="b0" /></b>
<b><at:var at:name="b1" /></b>
</coefficientSetFunctions>
<outputVariable>
<variableId>output</variableId>
</outputVariable>
</lowPass>
</filter>
</transformation>
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