fleg.f90

FORTRANvisualfortran常用数值算法集及源码

SUBROUTINE fleg(x,pl,nl)
INTEGER nl
REAL x,pl(nl)
INTEGER j
REAL d,f1,f2,twox
pl(1)=1.
pl(2)=x
if(nl>2) then
  twox=2.*x
  f2=x
  d=1.
  do j=3,nl
    f1=d
    f2=f2+twox
    d=d+1.
    pl(j)=(f2*pl(j-1)-f1*pl(j-2))/d
  end do
endif
END SUBROUTINE fleg