complex-gematrix-views.cc (flens/examples/complex-gematrix-views.cc)

      1
      2
      3
      4
      5
      6
      7
      8
      9
     10
     11
     12
     13
     14
     15
     16
     17
     18
     19
     20
     21
     22
     23
     24
     25
     26
     27
     28
     29
     30
     31
     32
     33
     34
     35
     36
     37
     38
     39
     40
     41
     42
     43
     44
     45
     46
     47
     48
     49
     50
     51

#include <cxxstd/complex.h>

#include <cxxstd/iostream.h>

#include <flens/flens.cxx>

using namespace flens;

using namespace std;

int

main()

{

///

/// Some typedefs for real and complex valued matrices.

///

   typedef GeMatrix<FullStorage<complex<double> > >    ComplexGeMatrix;

   typedef GeMatrix<FullStorage<double> >              RealGeMatrix;

    const int m = 5;

    const int n = 4;

    ComplexGeMatrix  Z(m,n);

///

/// See the next page for details on `IndexVariable` and `Complex`.

///

    ComplexGeMatrix::IndexVariable  i,j;

    Z(i,j) = Complex(i+j,j-i);

///

/// You can initialize a real valued matrix through the constructor.

///

    RealGeMatrix X = real(Z);

///

///  Or through an assignment.

///

    RealGeMatrix  Y;

    Y = imag(Z);

    cout << "Z = " << Z << endl;

    cout << "real(Z) = " << X << endl;

    cout << "imag(Z) = " << Y << endl;

///

/// You also can overwrite the real- or imaginary-part of a complex matrix with

/// a real valued matrix.  In this case we swap the real- and imaginary parts

/// of $Z$.  This is possible as $X$ and $Y$ contain copies.

///

    real(Z) = Y;

    imag(Z) = X;

    cout << "Z = " << Z << endl;

}