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Well, you should perhaps tell what you would expect... Let me suggest two workarounds:

• use a Python function instead:

  sage: M = lambda x : matrix(2, 2, [x,x,x,x])
  sage: M(3)
  [3 3]
  [3 3]
  

• if you want to consider your matrix as a symbolic object:

  sage: var('x'); M = matrix(2, 2, [x,x,x,x])
  x
  sage: M
  [x x]
  [x x]
  sage: M.substitute(x=3)
  [3 3]
  [3 3]
  

Well, you should perhaps tell what you would expect... Let me suggest two workarounds:possibilities:

• use a Python function instead:function:

  sage: M = lambda x : matrix(2, 2, [x,x,x,x])
  sage: M(3)
  [3 3]
  [3 3]
  

• if you want to consider your matrix as a symbolic object:

  sage: var('x'); M = matrix(2, 2, [x,x,x,x])
  x
  sage: M
  [x x]
  [x x]
  sage: M.substitute(x=3)
  [3 3]
  [3 3]