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40 lines
1.3 KiB
Fortran
40 lines
1.3 KiB
Fortran
*DECK DQWGTS
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DOUBLE PRECISION FUNCTION DQWGTS (X, A, B, ALFA, BETA, INTEGR)
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C***BEGIN PROLOGUE DQWGTS
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C***SUBSIDIARY
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C***PURPOSE This function subprogram is used together with the
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C routine DQAWS and defines the WEIGHT function.
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C***LIBRARY SLATEC
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C***TYPE DOUBLE PRECISION (QWGTS-S, DQWGTS-D)
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C***KEYWORDS ALGEBRAICO-LOGARITHMIC, END POINT SINGULARITIES,
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C WEIGHT FUNCTION
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C***AUTHOR Piessens, Robert
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C Applied Mathematics and Programming Division
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C K. U. Leuven
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C de Doncker, Elise
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C Applied Mathematics and Programming Division
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C K. U. Leuven
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C***SEE ALSO DQK15W
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C***ROUTINES CALLED (NONE)
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C***REVISION HISTORY (YYMMDD)
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C 810101 DATE WRITTEN
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C 890531 Changed all specific intrinsics to generic. (WRB)
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C 890531 REVISION DATE from Version 3.2
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C 891214 Prologue converted to Version 4.0 format. (BAB)
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C 900328 Added TYPE section. (WRB)
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C***END PROLOGUE DQWGTS
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C
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DOUBLE PRECISION A,ALFA,B,BETA,BMX,X,XMA
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INTEGER INTEGR
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C***FIRST EXECUTABLE STATEMENT DQWGTS
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XMA = X-A
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BMX = B-X
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DQWGTS = XMA**ALFA*BMX**BETA
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GO TO (40,10,20,30),INTEGR
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10 DQWGTS = DQWGTS*LOG(XMA)
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GO TO 40
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20 DQWGTS = DQWGTS*LOG(BMX)
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GO TO 40
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30 DQWGTS = DQWGTS*LOG(XMA)*LOG(BMX)
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40 RETURN
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END
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