zs1s2.f
SUBROUTINE ZS1S2 (ZRR, ZRI, S1R, S1I, S2R, S2I, NZ, ASCLE, ALIM,
+ IUF)
C***BEGIN PROLOGUE ZS1S2
....
....
Warning: this routine is not intended to be user-callable.
....
....
C***SUBSIDIARY
C***PURPOSE Subsidiary to ZAIRY and ZBESK
C***LIBRARY SLATEC
C***TYPE ALL (CS1S2-A, ZS1S2-A)
C***AUTHOR Amos, D. E., (SNL)
C***DESCRIPTION
C
C ZS1S2 TESTS FOR A POSSIBLE UNDERFLOW RESULTING FROM THE
C ADDITION OF THE I AND K FUNCTIONS IN THE ANALYTIC CON-
C TINUATION FORMULA WHERE S1=K FUNCTION AND S2=I FUNCTION.
C ON KODE=1 THE I AND K FUNCTIONS ARE DIFFERENT ORDERS OF
C MAGNITUDE, BUT FOR KODE=2 THEY CAN BE OF THE SAME ORDER
C OF MAGNITUDE AND THE MAXIMUM MUST BE AT LEAST ONE
C PRECISION ABOVE THE UNDERFLOW LIMIT.
C
C***SEE ALSO ZAIRY, ZBESK
C***ROUTINES CALLED ZABS, ZEXP, ZLOG
C***REVISION HISTORY (YYMMDD)
C 830501 DATE WRITTEN
C 910415 Prologue converted to Version 4.0 format. (BAB)
C 930122 Added ZEXP and ZLOG to EXTERNAL statement. (RWC)
C***END PROLOGUE ZS1S2