question: private static DoubleMatrix2D xdistanceOld ( DoubleMatrix2D matrix , int norm ) { return null ; }
target:  Constructs and returns the distance matrix of the given matrix. The distance matrix is a square, symmetric matrix consisting of nothing but distance coefficients.  The rows and the columns represent the variables, the cells represent distance coefficients.  The diagonal cells (i.e. the distance between a variable and itself) will be zero. Compares two column vectors at a time. Use dice views to compare two row vectors at a time.