numerical matrix classes

  CDSMatrixes are container objects for numerical contents. Elements
can be assigned to and read from using [i,j] index notation.
They can be added, subtracted, and multiplied 

classes:
 CDSMatrix_double
 CDSMatrix_DComplex
 CDSMatrix_int


Constructor:

   here, replace ``type'' with the appropriate containee type (e.g. ``double'')

 CDSMatrix_type(rows,cols,initializer) - initializer optional.
 CDSMatrix_type(otherMatrix) - construct a new CDSMatrix, initializing
                               elements from those of otherMatrix.

Also:

   SymMatrix_double(size)     - construct symmetric real matrix of specified
                                size
   SymMatrix_double(lowerTri) - construct symmetric real matrix from 
                                a lower triangular matrix. Example:
                                   s = SymMatrix_double([1,2,3])
                                   print s
                                   [1, 2]
			           [2, 3]

Methods:

  fromList(list) - set elements from a sequence of sequences.
 
  rows() - number of rows
  cols() - number of columns

  set(val) - set all elements to val.
  setDiag(val) - set all diagonal elements to val.
  scale(val) - scale all elements by val.

One can multiply CDSMatrixes by CDSMatrixes and by <m cdsVector>.CDSVectors.

In addition there are the functions:

 transpose(mat) - return the matrix transpose
 inverse(mat)   - return the matrix inverse
 svd(mat) - perform singular value decomposition on mat, and return the
            results in a structure with members
               sigma - singular values
               u     - left matrix
               vT    - right matrix
            Note that the singular value representation of mat is
                    u * sigma * vT
 eigen(mat) - perform eigenvalue analysis on mat. This returns a list of 
              eigenPairs, each of which has accessors value and vector
              which which return the expected information.
 trace(mat) - return trace of mat
 det(mat)   - return determinate of mat