class AliSymMatrix: public AliMatrixSq

 default constructor

constructor for matrix with defined size

 copy constructor

 assignment operator

 add operator

 clear dynamic part

 get fraction of non-zero elements

 print itself

 fill vecOut by matrix*vecIn
 vector should be of the same size as the matrix

 Return a matrix with Choleski decomposition
 Adopted from Numerical Recipes in C, ch.2-9, http://www.nr.com
 consturcts Cholesky decomposition of SYMMETRIC and
 POSITIVELY-DEFINED matrix a (a=L*Lt)
 Only upper triangle of the matrix has to be filled.
 In opposite to function from the book, the matrix is modified:
 lower triangle and diagonal are refilled.

 Invert matrix using Choleski decomposition

 Invert matrix using Choleski decomposition, provided the Cholseki's L matrix

 Adopted from Numerical Recipes in C, ch.2-9, http://www.nr.com
 Solves the set of n linear equations A x = b,
 where a is a positive-definite symmetric matrix.
 a[1..n][1..n] is the output of the routine CholDecomposw.
 Only the lower triangle of a is accessed. b[1..n] is input as the
 right-hand side vector. The solution vector is returned in b[1..n].

 add empty rows

 if additional rows exist, regularize it

 get pointer on the row

   Solution a la MP1: gaussian eliminations
  Obtain solution of a system of linear equations with symmetric matrix
  and the inverse (using 'singular-value friendly' GAUSS pivot)

 ---------------------------------- Dummy methods of MatrixBase

 ----------------------------- Choleski methods ----------------------------------------