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mctst2.f
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2002-06-11
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786b
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C
C PAGE 345-346: NUMERICAL MATHEMATICS AND COMPUTING, CHENEY/KINCAID, 1985
C
C FILE: MCTST2.FOR
C
C NUMERICAL VALUE OF INTEGRAL OVER A DISK IN XY-SPACE BY MONTE CARLO (RANDOM)
C
DATA L,N,SUM/256,1000,0.0/
F(X,Y) = SIN(SQRT(ALOG(X + Y + 1.0)))
PI4 = ATAN(1.0)
DO 3 I = 1,N
2 X = RANDOM(L)
Y = RANDOM(L)
IF((X - 0.5)**2 + (Y - 0.5)**2 .GT. 0.25) GO TO 2
SUM = SUM + F(X,Y)
IF(MOD(I,250) .EQ. 0) THEN
VOL = PI4*SUM/REAL(I)
PRINT 4,I,VOL
END IF
3 CONTINUE
4 FORMAT(5X,I5,F10.5)
STOP
END
FUNCTION RANDOM(L)
L = MOD(16807*L,2147483647)
RANDOM = REAL(L)*4.6566128752458E-10
RETURN
END