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This function is used by Ignition's Expression language.

Description

Calculates the simple standard deviation of the values in the given column of the given dataset, or the standard deviation for a series of numbers specified as arguments. When looking up the standard deviation in a dataset, the column may be specified as an index or as a column name. Any null values in the column are ignored. 

Syntax

stdDev(dataset, columnIndex)

  • Parameters

Dataset dataset - The dataset to search through.

Integer columnIndex - The index of the column to search through. Must be a column index of the provided dataset.

  • Returns

Integer/Float The standard deviation of the values in that column.

Syntax

stdDev(dataset, columnName)

  • Parameters

Dataset dataset - The dataset to search through.

String columnName - The name of the column to search through. Must match a column name in the provided dataset.

  • Returns

Integer/Float The standard deviation of the values in that column.

Syntax

stdDev(value, [value, ...])

  • Parameters

Integer/Float value - A number. Can be as many values as needed. Can be either a float or an integer.

  • Returns

Integer/Float The standard deviation of the values in the list of values.

The following feature is new in Ignition version 8.1.8
Click here to check out the other new features

The following overload was added in 8.1.8:

Syntax

stdDev(sequence)

  • Parameters

Sequence sequence - A list, tuple, array, or set of numerical values. 

  • Returns

Integer/Float The standard deviation of the values in the list of values.

Examples
For example, suppose you had a table with this dataset in it:


ProductCode

Quantity

Weight

BAN_002

380

3.243

BAN_010

120

9.928

APL_000

125

1.287

FWL_220

322

7.889

Code Snippet
stdDev({Root Container.Table.data}, "Weight") //... would return 3.4687.
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