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1F1(a,b,c)=1+a*c/(b*1!)+a(a+1)*c^2/(b(b+1)*2!)
                    +a(a+1)(a+2)*c^3/(b(b+1)(b+2)*3!)+......
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        program fhgfh
        implicit real*8(a-z)
       a=0.5
        garm=2.5
        f=4

        z=confluent(a,garm,f)

        write(*,*) z
        end
c      confluent hypergeometric function

        real*8 function  confluent(a,garm,z)
        implicit real*8(a-z)
        confluent=1.0
        do 11 ii=1,120
      
       confluent=confluent+lianchen(a,ii)*z**ii/
     1         (lianchen(garm,ii)*FACTORIAL(ii))
   11 CONTINUE
      return
      END

      REAL*8 FUNCTION lianchen(a,N)
      IMPLICIT REAL*8(A-Z)
        lianchen=a
        do 22 ii=1,N-1
             lianchen=lianchen*(a+ii)
   22 CONTINUE
      return
      END             

        REAL*8 FUNCTION FACTORIAL(N)
      IMPLICIT REAL*8(A-Z)
        FACTORIAL=1.0
      DO 101 I=1,N
           FACTORIAL=FACTORIAL*I
  101 CONTINUE
      return
      END


[ Last edited by janecool on 2011-3-25 at 20:30 ]
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