Internal function: return character(0) instead of NULL. This is sometimes needed not to return error when applying some functions.
nn(x)
x | Input variable |
---|
character(0)
if x==NULL
, x
elsewhere
License: GPL 3.0
L. Ranghetti, M. Boschetti, F. Nutini, L. Busetto (2020). "sen2r": An R toolbox for automatically downloading and preprocessing Sentinel-2 satellite data. Computers & Geosciences, 139, 104473. DOI: 10.1016/j.cageo.2020.104473, URL: http://sen2r.ranghetti.info/.
#> <simpleError in basename(NULL): richiesti argomenti di tipo vector>#> character(0)#> character(0)