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! CONDICIONES DE FRONTERA b(1)=1. c(1)=0. d(1)=c1 a(imax)=0. b(imax)=1. d(imax)=c2 ! COMIENZAN LOS PASOS DE TIEMPO t=0 30 CONTINUE t=t+delt DO 40 i=2,imax-1 d(i)=alfa*pn(i) 40 CONTINUE CALL thomas(a,b,c,d,p,imax) WRITE(*,800)t,(p(i),i=1,imax) DO 50 i=1,imax pn(i)=p(i) 50 CONTINUE IF (t.LT.tiempo) GO TO 30 800 FORMAT(200F8.1) END PROGRAM !======================================================thomas SUBROUTINE thomas(a,b,c,d,p,n) ! Esta es la solución del sistema de ecuaciones tridiagonales ! a, b, c y d: son los coeficientes de la ecuación, ! a(i)*x(i-1)+b(i)*x(i)+c(i)*x(i+1)=d(i) ! p= vector solución ! n= numero de variables
DIMENSION a(*),b(*),c(*),d(*),p(*),w(101),g(101) w(1)=b(1) g(1)=d(1)/w(1) DO 1 i=2,n w(i)=b(i)-a(i)*c(i-1)/w(i-1) g(i)=(d(i)-a(i)*g(i-1))/w(i) 1 CONTINUE p(n)=g(n) DO 2 i=n-1,1,-1 p(i)=g(i)-c(i)*p(i+1)/w(i) 2 CONTINUE DC@BD?
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