With this transformation a gradient of a timeserie can be calculated: (y1-y0) / (t1-t0). This is the change in the value per time unit (currently seconds).
<transformation id="Calculate_the_gradient"> <gradient> <firstOrder> <inputVariable> <variableId>InputTimeSeries</variableId> </inputVariable> <outputVariable> <variableId>OutputTimeSeries</variableId> </outputVariable> </firstOrder> </gradient> </transformation>
Example:
<variable> <variableId>niveau_5.nonequiAB</variableId> <timeSeriesSet> <moduleInstanceId>ABBAberekening</moduleInstanceId> <valueType>scalar</valueType> <parameterId>ALMR006</parameterId> <locationSetId>ABBA_vuldebiet</locationSetId> <timeSeriesType>external historical</timeSeriesType> <timeStep unit="nonequidistant"/> <relativeViewPeriod unit="day" start="-7" end="0" startOverrulable="true" endOverrulable="true"/> <readWriteMode>add originals</readWriteMode> </timeSeriesSet> </variable> <variable> <variableId>stijging.nonequi</variableId> <timeSeriesSet> <moduleInstanceId>ABBAberekening</moduleInstanceId> <valueType>scalar</valueType> <parameterId>stijging_niveaumeter</parameterId> <locationSetId>ABBA_vuldebiet</locationSetId> <timeSeriesType>external historical</timeSeriesType> <timeStep unit="nonequidistant"/> <relativeViewPeriod unit="day" start="-6" end="0" startOverrulable="true" endOverrulable="true"/> <readWriteMode>add originals</readWriteMode> </timeSeriesSet> </variable> <transformation id="stijging_niveaumeter"> <gradient> <firstOrder> <inputVariable> <variableId>niveau_5.nonequiAB</variableId> </inputVariable> <outputVariable> <variableId>stijging.nonequi</variableId> </outputVariable> </firstOrder> </gradient> </transformation>