Choose between protection against errors or faster performance by enabling (the default) or disabling data-consistency and sanity checks.
enable_check_spct()disable_check_spct()
set_check_spct(x)
logical Flag to enable (TRUE), disable (FALSE) or unset (NULL) option.
The previous value of the option, which can be passed as argument
  to function set_check_spct() to restore the previous state of the
  option.
Other data validity check functions: 
check_spct(),
check_spectrum(),
check_w.length()