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30 lines
786 B
Fortran
30 lines
786 B
Fortran
*DECK PGSF
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FUNCTION PGSF (X, IZ, C, A, BH)
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C***BEGIN PROLOGUE PGSF
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C***SUBSIDIARY
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C***PURPOSE Subsidiary to CBLKTR
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C***LIBRARY SLATEC
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C***TYPE SINGLE PRECISION (PGSF-S)
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C***AUTHOR (UNKNOWN)
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C***SEE ALSO CBLKTR
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C***ROUTINES CALLED (NONE)
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C***REVISION HISTORY (YYMMDD)
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C 801001 DATE WRITTEN
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C 891214 Prologue converted to Version 4.0 format. (BAB)
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C 900402 Added TYPE section. (WRB)
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C***END PROLOGUE PGSF
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DIMENSION A(*) ,C(*) ,BH(*)
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C***FIRST EXECUTABLE STATEMENT PGSF
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FSG = 1.
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HSG = 1.
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DO 101 J=1,IZ
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DD = 1./(X-BH(J))
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FSG = FSG*A(J)*DD
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HSG = HSG*C(J)*DD
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101 CONTINUE
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IF (MOD(IZ,2)) 103,102,103
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102 PGSF = 1.-FSG-HSG
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RETURN
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103 PGSF = 1.+FSG+HSG
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RETURN
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END
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