len
The len method returns the length of the given input. This is useful in query strings where a user needs to get the size of a Vector or a Java array.
Syntax
len(values)
Parameters
| Parameter | Type | Description |
|---|---|---|
| values | byte[] | An input array for which the length will be calculated. |
| values | char[] | An input array for which the length will be calculated. |
| values | double[] | An input array for which the length will be calculated. |
| values | float[] | An input array for which the length will be calculated. |
| values | int[] | An input array for which the length will be calculated. |
| values | long[] | An input array for which the length will be calculated. |
| values | short[] | An input array for which the length will be calculated. |
| values | LongSizedDataStructure | An input array for which the length will be calculated. |
| values | T[] | An input array for which the length will be calculated. |
Returns
A long-typed value representing the length of the input.
Example
The following example demonstrates the use of len within a query string. Note that we must modify the "IntegerColumn" name to "IntegerColumn_" with the _ suffix to allow the Deephaven engine to access the column's array representation.
source = emptyTable(10).update("X = i").groupBy()
result = source.update("LenX = len(X)")
- source
- result