Is an Object of Class ‘select’?

Checks whether its argument is an object of class ‘select’.

is.select(x)

Arguments

x	an R object to be tested.

Details

Tests if x is an object of class ‘select’, i.e. if x has a “class” attribute equal to select.

Value

TRUE if x is an object of class ‘select’ and FALSE otherwise

Author

Julien Ide

See also

atom.select

Examples

# Read a PDB file
pdb <- read.pdb( system.file("examples/1hel.pdb", package="bio3d") )

# Print structure summary
atom.select(pdb)
#> 
#>  Call:  atom.select.pdb(pdb = pdb)
#> 
#>    Atom Indices#: 1001  ($atom)
#>    XYZ  Indices#: 3003  ($xyz)
#> 
#> + attr: atom, xyz, call

# Select all C-alpha atoms with residues numbers between 43 and 54
ca.inds <- atom.select(pdb, "calpha", resno=43:54)
is.select(ca.inds)
#> [1] TRUE