This is a service routine for ?lamc2.
call slamc4( emin, start, base )
call dlamc4( emin, start, base )
REAL for slamc4
DOUBLE PRECISION for dlamc4
The starting point for determining emin.
INTEGER. The base of the machine.
INTEGER. The minimum exponent before (gradual) underflow, computed by setting a = start and dividing by base until the previous a can not be recovered.