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--- visual3d:documentation:pipeline:metric_commands:metric_signal_value_at_event [2024/06/19 13:37] – removed sgranger
+++ visual3d:documentation:pipeline:metric_commands:metric_signal_value_at_event [2025/05/21 17:36] (current) – Cleaned up page for a customer. Still needs to be put into Pipeline project format. wikisysop
@@ Line 1: / Line 1: @@
+====== Metric Signal Value At Event ======
+The Metric_Signal_Value_At_Event command provides the value of the specified signal at the specified frame of data is stored as a metric.
+Notes:
+  * All components of the specified signal will be stored in the metric signal. The user also has the option to select an individual component
+  * If there are multiple occurrences of an EVENT, there will be multiple entries in the metric that is created.
+  * There is an option to calculate the mean and standard deviation for metrics that have multiple values.
+  * In cases where there is **NO_DATA** at an event, you need to specify the parameter **/Retain_No_Data_Values=TRUE** should you want this included in the resulting signal.
+  * **Metric_Signal_At_Event** replaced the legacy command **Signal_Value_At_Event**
+{{:MetricSignalValueAtEvent.png}}
+===== Parameters =====
+^ Parameter ^ Description ^
+|**/Result_Metric_Name=**                                                                 |The name of the resulting signal.                                                                                                                                        |
+|**/Result_Metric_Folder=**                                                               |The folder that will contain the resulting signal                                                                                                                        |
+|**/[[Visual3D:Documentation:Pipeline:General_Information:Signal_Types|Signal_Types]]=**  |The type of signal to be evaluated                                                                                                                                       |
+|**/[[Visual3D:Documentation:Pipeline:General_Information:Signal_Names|Signal_Names]]=**  |The names of the signals to be evaluated                                                                                                                                 |
+|**/[[Visual3D:Documentation:Pipeline:General_Information:Signal_Folder|Signal_Folder]]=**|The name of the signal folder                                                                                                                                            |
+|**/Event_Name=**                                                                         |The name of the event Label.                                                                                                                                             |
+|**/Generate_Mean_And_Stddev=**                                                           |If there are multiple occurences of the Event, the metric will contain multiple values.If Selecte the mean and standard deviation for the metric values will be computed.|
+|**/Append_To_Existing_Values=**                                                          |(True or False) If the metric exists, the new values will be appended to the metric, retaining all of the previous values.                                               |
+|**/Generate_Metric_Length_Metric=**                                                      |(True or False) If the metric is a vector quantity (e.g. has 3 components), compute the magnitude of the vector.                                                         |
+|**/Retain_No_Data_Values=**                                                              |(True or False) If the result is no_data, retain the value.                                                                                                              |
+===== Example: Find Value of a Target =====
+This example calculates the value of the TARGET **RFT1** at the Event_Label **RON**
+<code>
+Metric_Signal_Value_At_Event
+/Result_Metric_Name=RFT1_ON
+/Result_Metric_Folder=PROCESSED
+/Signal_Types=TARGET
+/Signal_Names=RFT1
+/Signal_Folder=ORIGINAL
+/Event_Name=RON
+/Generate_Mean_And_Stddev=FALSE
+/Append_To_Existing_Values=FALSE
+/Generate_Metric_Length_Metric=FALSE
+/Retain_No_Data_Values=TRUE
+;
+</code>
+==== For a single Component ====
+Since Metric_Signal_Value_At_Event outputs all three components, here is a workaround of the previous example that will output one component. Evaluate_Expression is used to create a signal with one component, the z component for **RFT1**. Then the Metric_Signal_Value_At_Event will calculate the value of the TARGET **RFT1** at the Event_Label **RON**.
+<code>
+! RFT1 Z component
+Evaluate_Expression
+/Expression=TARGET::ORIGINAL::RFT1::Z
+/Result_Name=RFT1_Z
+/Result_Type=DERIVED
+/Result_Folder=ORIGINAL
+;
+Metric_Signal_Value_At_Event
+/Result_Metric_Name=RFT1_ON
+/Result_Metric_Folder=PROCESSED
+/Signal_Types=DERIVED
+/Signal_Names=RFT1_Z
+/Signal_Folder=ORIGINAL
+/Event_Name=RON
+/Generate_Mean_And_Stddev=FALSE
+/Append_To_Existing_Values=FALSE
+/Generate_Metric_Length_Metric=FALSE
+/Retain_No_Data_Values=TRUE
+;
+</code>
+===== Example: Calculate the Time of an Event =====
+This example calculates the time of the Event_Label **RON**
+<code>
+Metric_Signal_Value_At_Event
+/Result_Metric_Name=RON_TIME
+/Result_Metric_Folder=PROCESSED
+/Signal_Types=FRAME_NUMBERS
+/Signal_Names=TIME
+/Signal_Folder=ORIGINAL
+/Event_Name=RON
+/Generate_Mean_And_Stddev=FALSE
+/Append_To_Existing_Values=FALSE
+/Generate_Metric_Length_Metric=FALSE
+/Retain_No_Data_Values=FALSE
+;
+</code>
+===== P2D Signals =====
+Consider a [[visual3d:documentation:definitions:file_formats:p2d_format|P2D]] signal created using [[Visual3D:Documentation:Pipeline:Signal_Commands:Global_Normalized_Signal_Mean|Global_Normalized_Signal_Mean]]. The resulting signal has three components, an index, a mean signals, and a standard deviation signal. It is possible to compute the maximum value of the 3 components using [[Visual3D:Documentation:Pipeline:Metric_Commands:Metric_Maximum|Metric_Maximum]] but it isn't possible to directly identify the standard deviation at that index because it isn't possible to define an Event for a time normalized signal (e.g.it has no frame rate or time.
+Without having an event you cannot get the value of a signal at that event using Metric_Signal_Value_At_Event. One solution, albeit a non-intuitive solution is to [[Visual3D:Documentation:Pipeline:Expressions:Expressions_Overview#Signal_Functions|SORT]] (descending) the P2D signal by the second component (eg. the MEAN).
+<code>
+Evaluate_Expression
+/EXPRESSION=SORT(P2D::TEST::LHIP_ANGLE, -1.0, 2)
+! /SIGNAL_TYPES=
+! /SIGNAL_FOLDER=ORIGINAL
+! /SIGNAL_NAMES=
+/RESULT_TYPES=P2D
+/RESULT_FOLDERS=TEST_SORTED
+/RESULT_NAME=LHIP_ANGLE_SORTED
+!/APPLY_AS_SUFFIX_TO_SIGNAL_NAME=FALSE
+;
+</code>
+For the resulting signal, the maximum value and the associated standard deviation will be in the first frame.