class ROOT::Math::SMatrix<double,2,2,ROOT::Math::MatRepSym<double,2> >

Assign from another compatible matrix.
Possible Symmetirc to general but NOT vice-versa

Assign from a matrix expression

Assign from an identity matrix

 @name --- Access functions --- 
 access the parse tree with the index starting from zero and
following the C convention for the order in accessing
the matrix elements.
Same convention for general and symmetric matrices.

 return read-only pointer to internal array

 @name --- STL-like interface ---
The iterators access the matrix element in the order how they are
stored in memory. The C (row-major) convention is used, and in the
case of symmetric matrices the iterator spans only the lower diagonal
block. For example for a symmetric 3x3 matrices the order of the 6
elements \f${a_0,...a_5}\f$ is:
\f[
M = \left( \begin{array}{ccc}
a_0 & a_1 & a_3  \\
a_1 & a_2  & a_4  \\
a_3 & a_4 & a_5   \end{array} \right)
\f]

 STL iterator interface. 

 STL iterator interface. 

 STL const_iterator interface. 

 STL const_iterator interface. 

 @name --- Operators --- 
 element wise comparison

 element wise comparison

 element wise comparison

 element wise comparison

 element wise comparison

read only access to matrix element, with indices starting from 0

read only access to matrix element, with indices starting from 0.
Fuction will check index values and it will assert if they are wrong

addition with a scalar

subtraction with a scalar

multiplication with a scalar

division with a scalar

 @name --- Linear Algebra Functions --- 

Invert a square Matrix ( this method changes the current matrix).
Return true if inversion is successfull.
The method used for general square matrices is the LU factorization taken from Dinv routine
from the CERNLIB (written in C++ from CLHEP authors)
In case of symmetric matrices Bunch-Kaufman diagonal pivoting method is used
(The implementation is the one written by the CLHEP authors)

Invert a square Matrix and  returns a new matrix. In case the inversion fails
the current matrix is returned.
\param ifail . ifail will be set to 0 when inversion is successfull.
See ROOT::Math::SMatrix::Invert for the inversion algorithm

determinant of square Matrix via Dfact.
Return true when the calculation is successfull.
\param det will contain the calculated determinant value
\b Note: this will destroy the contents of the Matrix!

determinant of square Matrix via Dfact.
Return true when the calculation is successfull.
\param det will contain the calculated determinant value
\b Note: this will preserve the content of the Matrix!

return a full Matrix row as a vector (copy the content in a new vector)

return a full Matrix column as a vector (copy the content in a new vector)

return diagonal elements of a matrix as a Vector.
It works only for squared matrices D1 == D2, otherwise it will produce a compile error

return the trace of a matrix
Sum of the diagonal elements

 @name --- Other Functions --- 

Function to check if a matrix is sharing same memory location of the passed pointer
This function is used by the expression templates to avoid the alias problem during
expression evaluation. When  the matrix is in use, for example in operations
like A = B * A, a temporary object storing the intermediate result is automatically
created when evaluating the expression.

 submatrices
 Print: used by operator<<()