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  1. Background: A property can be added to capsules for further filtering and aggregation through Seeq tools, including Histogram. All properties on a condition are stored as string values. This post examines how to add a property to a condition and then how those properties may be used. Adding Properties to a Condition Capsule properties may be used to store important information such as, Product Codes, Batch IDs, and Recipes. There are three functions in Seeq Formula which can add properties to the capsules in a condition: toCondition() - Dedicated function to transform a signal into a condition which contains a capsule for each value change in the input signal. The value of the signal is stored as a property of the capsule toCapsules() - Dedicated function to transform a signal into a condition which contains a capsule for each valid sample in the input signal. The value of the signal is stored as a property of the capsule. setProperty() - Flexible function which is used to assign properties to each capsule in a condition. It is most commonly used in SQL queries to attach transactional information from a data source to a capsule in a condition. toCondition() This function creates a capsule for every value change in a signal. This may be useful on a Batch ID signal or operating mode signal. The toCondition() function creates a new capsule for each value change and automatically assigns the signal value to a capsule property called 'Value'. Using the toCondition() operator on the Compressor Stage example data creates a capsule for each distinct value in the signal. The following image shows the condition created from performing toCondition() on the Compressor Stage Example Data. A capsule is created for each distinct value in the signal. This property may be viewed by adding the Value property to the Capsules Pane. The .toCapsules() operator works similiarly, but instead creates a new condition with a capsule for each sample point (regardless of whether the value has changed). setProperties() This flexible function is used to assign properties to a condition. Users must assign both a property name and value. The following syntax is an example of how the .setProperties() operator can be used in Formula to assign properties to the capsules in a condition. This example assigns a property of "Batch" with a value of '23' to each capsule in a condition. $condition.transform($capsule-> $capsule.setProperty('Batch',23)) In the next example, a High Power condition was created using Value Search tool (power >25). The following syntax can be used to assign a property called "averagePower" to each capsule in the High Power condition. The value of this property is calculated as the average Compressor Power during each High Power condition. Executing this Formula results in a new condition that contains the averagePower property for each capsule. Using Condition Properties Condition properties can be used in different ways, such as to filter the capsules in a Condition or to aggregate the data in Histogram Condition Filtering Capsule properties can be displayed in the Capsule Pane by adding a column to the table. These property columns may also be sorted in ascending or descending order. Once capsules within a condition have properties assigned, the filter() operator may be used in Formula to create new conditions containing only a subset of the original capsules. For example, the following syntax generates a new condition that only has the capsules where the Value property is equal to OFF. $condition.filter($capsule-> $capsule.getProperty('Value').isEqualTo('OFF')) Histogram Within the Histogram tool, users can select Condition as the aggregation type to create bins using capsule properties. The following example creates a Histogram based upon the Value property in the toCondition() condition. The output is a Histogram with a count of the number of capsules with a Value equal to each of the four stages of operation:
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