is.pdb(x) is.pdbs(x)
Checks whether its argument is an object of class ‘pdb’ or ‘pdbs’.
Tests if the object ‘x’ is of class ‘pdb’
(is.pdb) or ‘pdbs’ (is.pdbs), i.e. if ‘x’ has a
“class” attribute equal to pdb or pdbs.
# Read a PDB file pdb <- read.pdb( system.file("examples/1hel.pdb", package="bio3d") ) is.pdb(pdb)[1] TRUE