program laplace real dimension 15 15 V1 real dimension 15 15 V2 do 15

program laplace

real, dimension(15,15) :: V1
real, dimension(15,15) :: V2

do I=1,15
        do J=1,15
                V1(I,J) = 1000*random(L)
        end do
end do

do M=1,50
  do I=1,15
        do J=1,15
                V1(I,J) = (V1(I-1,J)+V1(I+1,J)+V1(I,J-1)+V1(I,J+1))/4
        end do
  end do
end do


      do i=1,15
          write(*,'(1X,100G14.5)') (V1(i,j),j=1,15)
       enddo

end program laplace

function random(L)
integer :: L
L = mod(1366*L+150889,714025)
Random=Real(L)/Real(7142024)
return
end