DescriptorEngine class allows automated calculation of
all available descriptors of a specified type. Note that this may not
be a good idea under R since certain descriptors may throw exceptions
which cannot be easily caught in rJava. However it is possible to
obtaina a variety of information from this object such as the class
names of the available descriptors, instances of these descriptors and
so on.get.desc.engine(type = 'molecular')DescriptorEngine objectget.desc.classnames, eval.desc, get.desc.values