set floating point exception mode
mod=ieee()
ieee(mod)
:mod integer scalar whose possible values are 0, 1 or 2 :
ieee() returns the current floating point exception mode.
:0 floating point exception produces an error : :1 floating point exception produces a warning : :2 floating point exception produces Inf or Nan :
ieee(mod) sets the current floating point exception mode.
The initial mode value is 0.
Floating point exception arising inside some library algorithms are not yet handled by ieee modes.
ieee(1);1/0
ieee(2);1/0,`log`_(0)