Le 16/10/2010 20:38, Cuong P. Nguyen a écrit : > Hi Luc and friends, > > Thanks a lot for the quick response > > Could you give me any simple code example of Complex-type vector-matrix > multiplication or matrix-matrix multiplication ? Here is a matrix vector multiplication: // create a 2x2 complex matrix Complex[][] matrixData = new Complex[][] { { new Complex(1.0, 0.0), new Complex( 0.0, 1.0) }, { new Complex(0.0, -1.0), new Complex(-1.0, 0.0) } }; FieldMatrix m = new Array2DRowFieldMatrix(matrixData); // create a vector Complex[] vectorData = new Complex[] { new Complex(1.0, 2.0), new Complex(3.0, 4.0), }; FieldVector u = new ArrayFieldVector(vectorData); // perform matrix-vector multiplication FieldVector v = m.operate(u); // print the initial vector for (int i = 0; i < u.getDimension(); ++i) { System.out.println(ComplexFormat.formatComplex(u.getEntry(i))); } System.out.println(); // print the result for (int i = 0; i < v.getDimension(); ++i) { System.out.println(ComplexFormat.formatComplex(v.getEntry(i))); } Luc > > I am a new java beginner as well as new to Commons Math community. > > Thanks, > > Cuong > > -----Original Message----- > From: Luc Maisonobe [mailto:Luc.Maisonobe@free.fr] > Sent: Saturday, October 16, 2010 1:25 PM > To: Commons Users List > Subject: [math] Re: complex matrix operation > > Le 16/10/2010 18:53, Cuong P. Nguyen a écrit : >> Hi, > > Hi Cuong, > > First, please use a [math] marker on the subject line when posting to > this list for the commons-math component. The list is shared among > several commons components and these markers help filtering. > >> can I use the package for basic complex-number matrix operations >> (addition, subtraction, multiplication) ? > > You can use the linear algebra packe from commons-math with complex > matrices. The appropriate interface is FieldMatrix which has > two implementations: Array2DRowFieldMatrix and > BlockFieldMatrix. The former should be preferred for small > sizes and the later for large sizes. You can also use complex vectors > and LU decomposition with these matrices. > > Luc > >> >> Thanks >> >> Cuong >> >> > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: user-unsubscribe@commons.apache.org > For additional commands, e-mail: user-help@commons.apache.org > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: user-unsubscribe@commons.apache.org > For additional commands, e-mail: user-help@commons.apache.org > --------------------------------------------------------------------- To unsubscribe, e-mail: user-unsubscribe@commons.apache.org For additional commands, e-mail: user-help@commons.apache.org