function dfToQGIS #29
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- Thread safe layer access
- QGIS$mapLayerByName('...')
- QGIS$featureCount( a layer )
- QGIS$toDataFrame( a layer )
eg
summary(QGIS$toDataFrame(QGIS$activeLayer))
summary(QGIS$toDataFrame(QGIS$mapLayerByName('my layer')))
Shaves a few percentage points off the execution time when iterating over OGR layers
This involves quite a dance -- we can't have optional arguments for cpp functions exposed via InternalFunction, so now we have to create pure R wrappers for the exposed functions instead and set the default values for optional arguments in those. The nice thing is that this gives us the opportunity to add R "sugar" to our functions so that they behave more like standard R modules (eg we could add documentation for them)
…ad-safe methods Now available as: - QGIS$toNumericVector(layer, field, selectedOnly) - QGIS$toSf(layer)
So that other non-python-console code editors can utilise this too
nyalldawson
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This nicely loads either
data.frameas layer without geometry orsfdataframe as classic layer. Works just ok and is reasonably fast.