[Numpy-discussion] Construct a large n-dimensional complex matrix

Robert Kern robert.kern@gmail....
Tue Apr 7 19:37:18 CDT 2009


On Tue, Apr 7, 2009 at 19:10, Jochen Schroeder <cycomanic@gmail.com> wrote:
> On 06/04/09 21:20, Robert Kern wrote:
>> On Mon, Apr 6, 2009 at 20:53, Nathan Faggian <nfaggian@unimelb.edu.au> wrote:
>> > HI,
>> > I want to construct a large complex matrix, I have the real and imaginary
>> > components as double vectors, is there a fast way to construct a complex
>> > vector in numpy?
>>
>> C = np.empty((n,m), dtype=complex)
>> C.real.flat[:] = real_values
>> C.imag.flat[:] = imag_values
>>
> Just a question, is there any advantage to doing
> C = 1.j *imag_values + real_values
> ?

Conciseness at the expense of large temporaries and unnecessary computation.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless
enigma that is made terrible by our own mad attempt to interpret it as
though it had an underlying truth."
  -- Umberto Eco


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