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32 lines
882 B
Fortran
32 lines
882 B
Fortran
*DECK ZDIV
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SUBROUTINE ZDIV (AR, AI, BR, BI, CR, CI)
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C***BEGIN PROLOGUE ZDIV
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C***SUBSIDIARY
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C***PURPOSE Subsidiary to ZBESH, ZBESI, ZBESJ, ZBESK, ZBESY, ZAIRY and
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C ZBIRY
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C***LIBRARY SLATEC
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C***TYPE ALL (ZDIV-A)
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C***AUTHOR Amos, D. E., (SNL)
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C***DESCRIPTION
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C
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C DOUBLE PRECISION COMPLEX DIVIDE C=A/B.
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C
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C***SEE ALSO ZAIRY, ZBESH, ZBESI, ZBESJ, ZBESK, ZBESY, ZBIRY
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C***ROUTINES CALLED ZABS
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C***REVISION HISTORY (YYMMDD)
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C 830501 DATE WRITTEN
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C 910415 Prologue converted to Version 4.0 format. (BAB)
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C***END PROLOGUE ZDIV
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DOUBLE PRECISION AR, AI, BR, BI, CR, CI, BM, CA, CB, CC, CD
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DOUBLE PRECISION ZABS
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EXTERNAL ZABS
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C***FIRST EXECUTABLE STATEMENT ZDIV
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BM = 1.0D0/ZABS(BR,BI)
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CC = BR*BM
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CD = BI*BM
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CA = (AR*CC+AI*CD)*BM
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CB = (AI*CC-AR*CD)*BM
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CR = CA
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CI = CB
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RETURN
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END
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