find_algorithms: Find and list available QGIS algorithms

In RQGIS: Integrating R with QGIS

Description

find_algorithms lists or queries all QGIS algorithms which can be accessed via the QGIS Python API.

Usage

find_algorithms(search_term = NULL, name_only = FALSE,
  qgis_env = set_env())

Arguments

search_term	If (NULL), the default, all available functions will be returned. If search_term is a character, all available functions will be queried accordingly. The character string might also contain a regular expression (see examples).
name_only	If TRUE, the function returns only the name(s) of the found algorithms. Otherwise, a short function description will be returned as well (default).
qgis_env	Environment settings containing all the paths to run the QGIS API. For more information, refer to set_env().

Details

Function find_algorithms simply calls processing.alglist using Python.

Value

The function returns QGIS function names and short descriptions as an R character vector.

Author(s)

Jannes Muenchow, Victor Olaya, QGIS core team

Examples

## Not run: 
# list all available QGIS algorithms on your system
algs <- find_algorithms()
algs[1:15]
# find a function which adds coordinates
find_algorithms(search_term = "add")
# find only QGIS functions
find_algorithms(search_term = "qgis:")
# find QGIS and SAGA functions related to centroid computations
find_algorithms(search_term = "centroid.+(qgis:|saga:)")

## End(Not run)

RQGIS documentation built on May 2, 2019, 8:23 a.m.