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bisect1.f
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2002-06-11
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946b
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C*****************************************************************************
C
C PAGE 77-78: NUMERICAL MATHEMATICS AND COMPUTING, CHENEY/KINCAID, 1985
C
C FILE: BISECT1.FOR
C
C FIRST VERSION OF BISECTION METHOD (BISECT,F,G)
C
EXTERNAL F,G
DATA AF/0.0/, BF/1.0/, N/50/
DATA AG/0.5/, BG/2.0/
CALL BISECT(F,AF,BF,N)
CALL BISECT(G,AG,BG,N)
STOP
END
FUNCTION F(X)
F = EXP(X) - 3.0*X
RETURN
END
FUNCTION G(T)
G = T**3 - 2.0*SIN(T)
RETURN
END
SUBROUTINE BISECT(F,A,B,N)
U=F(A)
V=F(B)
PRINT 6,A,U,B,V
IF(U*V) 2,7,7
2 DO 5 J=1,N
C=(A+B)*0.5
W=F(C)
PRINT 6,C,W
IF(W*U) 3,7,4
3 B=C
V=W
GO TO 5
4 A=C
U=W
5 CONTINUE
6 FORMAT(2X,2E22.14)
7 RETURN
END