C DL12 10
C ..................................................................DL12 20
C DL12 30
C SUBROUTINE DQL12 DL12 40
C DL12 50
C PURPOSE DL12 60
C TO COMPUTE INTEGRAL(EXP(-X)*FCT(X), SUMMED OVER X DL12 70
C FROM 0 TO INFINITY). DL12 80
C DL12 90
C USAGE DL12 100
C CALL DQL12 (FCT,Y) DL12 110
C PARAMETER FCT REQUIRES AN EXTERNAL STATEMENT DL12 120
C DL12 130
C DESCRIPTION OF PARAMETERS DL12 140
C FCT - THE NAME OF AN EXTERNAL DOUBLE PRECISION FUNCTION DL12 150
C SUBPROGRAM USED. DL12 160
C Y - THE RESULTING DOUBLE PRECISION INTEGRAL VALUE. DL12 170
C DL12 180
C REMARKS DL12 190
C NONE DL12 200
C DL12 210
C SUBROUTINES AND FUNCTION SUBPROGRAMS REQUIRED DL12 220
C THE EXTERNAL DOUBLE PRECISION FUNCTION SUBPROGRAM FCT(X) DL12 230
C MUST BE FURNISHED BY THE USER. DL12 240
C DL12 250
C METHOD DL12 260
C EVALUATION IS DONE BY MEANS OF 12-POINT GAUSSIAN-LAGUERRE DL12 270
C QUADRATURE FORMULA, WHICH INTEGRATES EXACTLY, DL12 280
C WHENEVER FCT(X) IS A POLYNOMIAL UP TO DEGREE 23. DL12 290
C FOR REFERENCE, SEE DL12 300
C SHAO/CHEN/FRANK, TABLES OF ZEROS AND GAUSSIAN WEIGHTS OF DL12 310
C CERTAIN ASSOCIATED LAGUERRE POLYNOMIALS AND THE RELATED DL12 320
C GENERALIZED HERMITE POLYNOMIALS, IBM TECHNICAL REPORT DL12 330
C TR00.1100 (MARCH 1964), PP.24-25. DL12 340
C DL12 350
C ..................................................................DL12 360
C DL12 370
SUBROUTINE DQL12(FCT,Y) DL12 380
C DL12 390
C DL12 400
DOUBLE PRECISION X,Y,FCT DL12 410
C DL12 420
X=.37099121044466920D2 DL12 430
Y=.8148077467426242D-15*FCT(X) DL12 440
X=.28487967250984000D2 DL12 450
Y=Y+.30616016350350208D-11*FCT(X) DL12 460
X=.22151090379397006D2 DL12 470
Y=Y+.13423910305150041D-8*FCT(X) DL12 480
X=.17116855187462256D2 DL12 490
Y=Y+.16684938765409103D-6*FCT(X) DL12 500
X=.13006054993306348D2 DL12 510
Y=Y+.8365055856819799D-5*FCT(X) DL12 520
X=.9621316842456867D1 DL12 530
Y=Y+.20323159266299939D-3*FCT(X) DL12 540
X=.68445254531151773D1 DL12 550
Y=Y+.26639735418653159D-2*FCT(X) DL12 560
X=.45992276394183485D1 DL12 570
Y=Y+.20102381154634097D-1*FCT(X) DL12 580
X=.28337513377435072D1 DL12 590
Y=Y+.9044922221168093D-1*FCT(X) DL12 600
X=.15126102697764188D1 DL12 610
Y=Y+.24408201131987756D0*FCT(X) DL12 620
X=.61175748451513067D0 DL12 630
Y=Y+.37775927587313798D0*FCT(X) DL12 640
X=.11572211735802068D0 DL12 650
Y=Y+.26473137105544319D0*FCT(X) DL12 660
RETURN DL12 670
END DL12 680