[有偿服务] 谁帮忙给转下这个fortan77 到matlab 实在里面的循环太多了

          subroutine gband(a,d,x,n,m,eps,ierr,ifrst)
      include'param.f'
      double precision a,d,x,eps,s
      dimension a(14*idim-12),d(idim),x(idim)
      integer n,m,ierr,ifrst,j,k,i,ie,ieux,ie1,mbig,j1,j2,jo,j1k,
     & iaux,ieaux,ik,jk,np1,iinv
      ierr =0
      j=1
      do 10 i=1,n
      ie=m
      if(i+m-n)21,21,22
22    ie=n-i
21    ieaux=m
      if(i-m)23,23,24
23    ieaux=i
24    ie1=ie+ieaux
      mbig=ie
      j1=j+ie1
      j2=j1
      if(ifrst.gt.0)goto 27
      if(dabs(a(j))-eps)25,25,27
25    ierr=ierr+1
27    if(mbig)10,10,26
26    do 20 jo=1,mbig
      s=a(j1)/a(j)
      if(ifrst.gt.0)goto 35
      do 30 k=1,mbig
      j1k=j1+k
      jk=j+k
30    a(j1k)=a(j1k)-a(jk)*s
35    continue
      iaux=jo+i
      d(iaux)=d(iaux)-d(i)*s
      ie=m
      if(iaux+m-n)31,31,32
32    ie=n-iaux
31    ieaux=m
      if(iaux-m)33,33,34
33    ieaux=iaux
34    ie1=ie+ieaux
20    j1=j1+ie1
10    j=j2+1
      j=j-m-1
      np1=n+1
c
      do 40 iinv=1,n
      i=np1-iinv
      ie=m
      if(i+m-n)41,41,42
42    ie=n-i
41    mbig=ie
      x(i)=d(i)
      if(mbig)44,44,43
c
43    do 50 k=1,mbig
      ik=i+k
      jk=j+k
50    x(i)=x(i)-x(ik)*a(ik)
c
44    x(i)=x(i)/a(j)
      ie=m
      if(i+m-np1)51,51,52
52    ie=np1-i
51    ieaux=m
      if(i-1-m)53,53,54
53    ieaux=i-1
54    ie1=ie+ieaux
      j=j-ie1-1
40    continue
      return
      end