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DQH48.FOR
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1985-11-29
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4KB
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117 lines
C
C ..................................................................
C
C SUBROUTINE DQH48
C
C PURPOSE
C TO COMPUTE INTEGRAL(EXP(-X*X)*FCT(X), SUMMED OVER X FROM
C -INFINITY TO +INFINITY).
C
C USAGE
C CALL DQH48 (FCT,Y)
C PARAMETER FCT REQUIRES AN EXTERNAL STATEMENT
C
C DESCRIPTION OF PARAMETERS
C FCT - THE NAME OF AN EXTERNAL DOUBLE PRECISION FUNCTION
C SUBPROGRAM USED.
C Y - THE RESULTING DOUBLE PRECISION INTEGRAL VALUE.
C
C REMARKS
C NONE
C
C SUBROUTINES AND FUNCTION SUBPROGRAMS REQUIRED
C THE EXTERNAL DOUBLE PRECISION FUNCTION SUBPROGRAM FCT(X)
C MUST BE FURNISHED BY THE USER.
C
C METHOD
C EVALUATION IS DONE BY MEANS OF 48-POINT GAUSSIAN-HERMITE
C QUADRATURE FORMULA, WHICH INTEGRATES EXACTLY WHENEVER
C FCT(X) IS A POLYNOMIAL UP TO DEGREE 95.
C FOR REFERENCE, SEE
C SHAO/CHEN/FRANK, TABLES OF ZEROS AND GAUSSIAN WEIGHTS OF
C CERTAIN ASSOCIATED LAGUERRE POLYNOMIALS AND THE RELATED
C GENERALIZED HERMITE POLYNOMIALS, IBM TECHNICAL REPORT
C TR00.1100 (MARCH 1964), PP.213-214.
C
C ..................................................................
C
SUBROUTINE DQH48(FCT,Y)
C
C
DOUBLE PRECISION X,Y,Z,FCT
C
X=.8975315081931687D1
Z=-X
Y=.7935551460773997D-35*(FCT(X)+FCT(Z))
X=.8310752190704784D1
Z=-X
Y=Y+.59846126933138784D-30*(FCT(X)+FCT(Z))
X=.7759295519765775D1
Z=-X
Y=Y+.36850360801506699D-26*(FCT(X)+FCT(Z))
X=.7266046554164350D1
Z=-X
Y=Y+.55645774689022848D-23*(FCT(X)+FCT(Z))
X=.68100645780741414D1
Z=-X
Y=Y+.31883873235051384D-20*(FCT(X)+FCT(Z))
X=.63805640961864106D1
Z=-X
Y=Y+.8730159601186677D-18*(FCT(X)+FCT(Z))
X=.59710722250135454D1
Z=-X
Y=Y+.13151596226584085D-15*(FCT(X)+FCT(Z))
X=.55773169812237286D1
Z=-X
Y=Y+.11975898654791794D-13*(FCT(X)+FCT(Z))
X=.51962877187923645D1
Z=-X
Y=Y+.70469325815458891D-12*(FCT(X)+FCT(Z))
X=.48257572281332095D1
Z=-X
Y=Y+.28152965378381691D-10*(FCT(X)+FCT(Z))
X=.44640145469344589D1
Z=-X
Y=Y+.7930467495165382D-9*(FCT(X)+FCT(Z))
X=.41097046035605902D1
Z=-X
Y=Y+.16225141358957698D-7*(FCT(X)+FCT(Z))
X=.37617264902283578D1
Z=-X
Y=Y+.24686589936697505D-6*(FCT(X)+FCT(Z))
X=.34191659693638846D1
Z=-X
Y=Y+.28472586917348481D-5*(FCT(X)+FCT(Z))
X=.30812489886451058D1
Z=-X
Y=Y+.25285990277484889D-4*(FCT(X)+FCT(Z))
X=.27473086248223832D1
Z=-X
Y=Y+.17515043180117283D-3*(FCT(X)+FCT(Z))
X=.24167609048732165D1
Z=-X
Y=Y+.9563923198194153D-3*(FCT(X)+FCT(Z))
X=.20890866609442764D1
Z=-X
Y=Y+.41530049119775525D-2*(FCT(X)+FCT(Z))
X=.17638175798953000D1
Z=-X
Y=Y+.14444961574981099D-1*(FCT(X)+FCT(Z))
X=.14405252201375652D1
Z=-X
Y=Y+.40479676984603849D-1*(FCT(X)+FCT(Z))
X=.11188121524021566D1
Z=-X
Y=Y+.9182229707928518D-1*(FCT(X)+FCT(Z))
X=.7983046277785622D0
Z=-X
Y=Y+.16920447194564111D0*(FCT(X)+FCT(Z))
X=.47864633759449610D0
Z=-X
Y=Y+.25396154266475910D0*(FCT(X)+FCT(Z))
X=.15949293584886247D0
Z=-X
Y=Y+.31100103037796308D0*(FCT(X)+FCT(Z))
RETURN
END