Operators

partition_dynamic (Operator)

Name

partition_dynamic — Partition a region horizontally at positions of small vertical extent.

Signature

partition_dynamic(Region : Partitioned : Distance, Percent : )

Description

partition_dynamic partitions the input Region horizontally into regions that have an approximate width of Distance. The input region is split at positions where it has a relativly small vertical extent.

The positions where the input region is split are determined by the following approach: First, initial split positions are determined such that they are equally distributed over the horizontal extent of the input region, i.e., such that all the resulting parts would have the same width. For this, the number n of resulting parts is determined by dividing the width of the input region by Distance and rounding the result to the closest integer value. The distance between the initial split positions is now calculated by dividing the width of the input region by n. Note that the distance between these initial split positions is typically not identical to Distance. Then, the final split positions are determined in the neighborhood of the initial split positions such that the input region is split at positions where it has the least vertical extent within this neighborhood. The maximum deviation of the final split position from the initial split position is Distance*Percent*0.01.

The resulting regions are returned in Partitioned. Note that the input region is only partitioned if its width is larger than 1.5 times Distance.

Parallelization

• Multithreading type: reentrant (runs in parallel with non-exclusive operators).
• Automatically parallelized on tuple level.

Parameters

Region (input_object)  region(-array) object

Region to be partitioned.

Partitioned (output_object)  region-array object

Partitioned region.

Distance (input_control)  real (real)

Approximate width of the resulting region parts.

Percent (input_control)  real (real)

Maximum percental shift of the split position.

Default value: 20

Suggested values: 0.0, 10.0, 20.0, 30.0, 40.0, 50.0, 70.0, 90.0, 100.0

Typical range of values: 0 ≤ Percent ≤ 100

Result

partition_dynamic returns 2 (H_MSG_TRUE) if all parameters are correct. The behavior in case of empty input (no regions given) can be set via set_system('no_object_result',<Result>), the behavior in case of an empty input region via set_system('empty_region_result',<Result>), and the behavior in case of an empty result region via set_system('store_empty_region',<'true'/'false'>). If necessary, an exception is raised.