title: 'numpy.ndarray' object has no attribute 'insert'
body: <p>I want to add one element to a vector which is geting:</p>
  
  <pre><code>import time
  from numpy import *
  from scipy.sparse.linalg import bicgstab,splu
  from scipy.sparse import lil_matrix,identity
  from scipy.linalg import lu_factor,lu_solve,cho_factor,cho_solve
  from matplotlib.pyplot import *
  
   #N,alfa and beta are introduced
  
      M = lil_matrix((2*N,2*N), dtype='float64')
      b=zeros(2*N)
      M.setdiag(alfa*ones(2*N),0)
      M.setdiag(beta*ones(2*N-1),1)
      M.setdiag(beta*ones(2*N-1),-1)
      M.setdiag(ones(2*N-2),2)
      M.setdiag(ones(2*N-2),-2)
      M=M.tocsc()
  
      for i in range(0,2*N):
          b[i]=2*dx*feval(fuente,x[i])/6.0
  
      A=1.0/(3.0*dx)*M
      u=bicgstab(A,b)
      usol=u[0]
  </code></pre>
  
  <p>And now I want <code>usol.insert(0,1)  usol=[1,usol[0],usol[1],..]</code> but I have an error 'numpy.ndarray' object has no attribute 'insert'</p>