stdDev
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 (index)​
stdDev(dataset, columnIndex)
Parameters​
| Type | Parameter | Description |
|---|---|---|
| Dataset | dataset | The starting dataset to search. |
| 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 (name)​
stdDev(dataset, columnName)
Parameters​
| Type | Parameter | Description |
|---|---|---|
| Dataset | dataset | The starting dataset to search. |
| 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 (value)​
stdDev(value, [value, ...])
Parameters​
| Type | Parameter | Description |
|---|---|---|
| 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.
Syntax (sequence)​
stdDev(sequence)
Parameters​
| Type | Parameter | Description |
|---|---|---|
| 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​
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 |
stdDev({Root Container.Table.data}, "Weight") //... would return 4.00532