qgis_randomextract: QGIS algorithm - Random extract

In JanCaha/r_package_qgis: An extension of package "qgisprocess" providing direct R functions for QGIS functions

QGIS algorithm - Random extract

Description

QGIS Algorithm provided by QGIS (native c++) Random extract (native:randomextract). This algorithm takes a vector layer and generates a new one that contains only a subset of the features in the input layer. The subset is defined randomly, using a percentage or count value to define the total number of features in the subset. —————- Notes —————- - This algorithm drops existing primary keys or FID values and regenerates them in output layers.

Usage

qgis_randomextract(
  INPUT = qgisprocess:::qgis_default_value(),
  METHOD = qgisprocess:::qgis_default_value(),
  NUMBER = qgisprocess:::qgis_default_value(),
  OUTPUT = qgisprocess:::qgis_default_value(),
  ...,
  .complete_output = .complete_output_option(),
  .quiet = .quiet_option(),
  .messages = .message_option()
)

Arguments

INPUT	source - Input layer. Path to a vector layer.
METHOD	enum of ⁠("Number of features", "Percentage of features")⁠ - Method. Number of selected option, e.g. '1'. Comma separated list of options, e.g. '1,3'.
NUMBER	number - Number/percentage of features. A numeric value. field:FIELD_NAME to use a data defined value taken from the FIELD_NAME field. expression:SOME EXPRESSION to use a data defined value calculated using a custom QGIS expression.
OUTPUT	sink - Extracted (random). Path for new vector layer.
...	further parameters passed to qgisprocess::qgis_run_algorithm()
.complete_output	logical specifying if complete out of qgisprocess::qgis_run_algorithm() should be used (TRUE) or first output (most likely the main) should read (FALSE). Default value is TRUE.
.quiet	logical specifying if parameter .quiet for qgisprocess::qgis_run_algorithm() Default value is TRUE.
.messages	logical specifying if messages from qgisprocess::qgis_run_algorithm() should be printed (TRUE) or not (FALSE). Default value is FALSE.

Details

Outputs description

• OUTPUT - outputVector - Extracted (random)

JanCaha/r_package_qgis documentation built on Nov. 3, 2024, 5:25 p.m.