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33 lines
947 B
Fortran
33 lines
947 B
Fortran
*DECK BSRH
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FUNCTION BSRH (XLL, XRR, IZ, C, A, BH, F, SGN)
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C***BEGIN PROLOGUE BSRH
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C***SUBSIDIARY
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C***PURPOSE Subsidiary to BLKTRI
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C***LIBRARY SLATEC
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C***TYPE SINGLE PRECISION (BCRH-S, BSRH-S)
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C***AUTHOR (UNKNOWN)
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C***SEE ALSO BLKTRI
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C***ROUTINES CALLED (NONE)
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C***COMMON BLOCKS CBLKT
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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 BSRH
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DIMENSION A(*) ,C(*) ,BH(*)
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COMMON /CBLKT/ NPP ,K ,EPS ,CNV ,
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1 NM ,NCMPLX ,IK
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C***FIRST EXECUTABLE STATEMENT BSRH
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XL = XLL
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XR = XRR
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DX = .5*ABS(XR-XL)
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101 X = .5*(XL+XR)
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IF (SGN*F(X,IZ,C,A,BH)) 103,105,102
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102 XR = X
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GO TO 104
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103 XL = X
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104 DX = .5*DX
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IF (DX-CNV) 105,105,101
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105 BSRH = .5*(XL+XR)
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RETURN
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END
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