program L
implicit none
integer,parameter:: nx=100,nt=100,p=2,te=5,E=2
integer:: i,j
real v

real:: ne(x,t)
real:: n0=5E+2,m=2.1,q=0.6E-19,k=0.514E-9,R=50.0,me=1.2E-3
v=n0*k

x=0.0
t=0.0
do i=1,nx
  x=x+i*0.02
  do j=1,nt
  t=t+j*0.01
  ne(0,0)=0.6E-19
ne(x+i*0.02,t+(j+1)*0.01)=-25*te/(me*v)*ne(x+(i+1)*0.02,t+j*0.01)+(1+50*te/(me*v))*ne(x+i*0.02,t+j*0.01)-25*te/(me*v)*ne(x+(i-1)*0.02,t+j*0.01)
  
open (unit=10,file="1.txt")
write (10,*) ne(x,t)

  end do
end do

stop
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