convert double to complex

Hi,

I have a small - but hard for me - problem.
I get a matrix of this type:
  typedef mtl::matrix< float_type, symmetric<lower>, envelope<>, row_major >::type EnvelopeMatrix;

where the float_type is a double. Now I will convert this matrix into a complex one of type

  typedef mtl::matrix< complex<double> , symmetric<lower>, envelope<>, row_major >::type ComplexEnvelopeMatrix;

I tried to use a constructor or copy but nothing will work...
Does anyone have a solution?

Thanks Mario

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