Python headers in R scripts for QGIS
1. The interface between QGIS and R is speci ed by a header in the R script. Each script starts with the Input and Output preceeded with ##.
2. If the script has an instruction ##MyScripts=group then the
algorithm will be added to MyScripts; otherwise, a new
group will be created;
3. The other input types besides group are vector,
Field Layer, table, number, string and boolean;
4. The output types are output vector, output raster,
output table;
5. The instruction ##showplots exports plots to the Result
Viewer; for console output, put > right before the output that
you want to send to the Result Viewer.
Search for R Syntax in Processing scripts to obtain more documentation about headers in R scripts for QGIS.