SLATEC Routines --- CSROOT ---

*DECK CSROOT
      SUBROUTINE CSROOT (XR, XI, YR, YI)
C***BEGIN PROLOGUE  CSROOT
C***SUBSIDIARY
C***PURPOSE  Compute the complex square root of a complex number.
C***LIBRARY   SLATEC
C***TYPE      SINGLE PRECISION (CSROOT-S)
C***AUTHOR  (UNKNOWN)
C***DESCRIPTION
C
C     (YR,YI) = complex sqrt(XR,XI)
C
C***SEE ALSO  EISDOC
C***ROUTINES CALLED  PYTHAG
C***REVISION HISTORY  (YYMMDD)
C   811101  DATE WRITTEN
C   891214  Prologue converted to Version 4.0 format.  (BAB)
C   900402  Added TYPE section.  (WRB)
C***END PROLOGUE  CSROOT