public void init( double diag[] ,
                      double off[],
                      int numCols ) {
        reset(numCols);

        this.diag = diag;
        this.off = off;
    }
public void init ( double diag [ ] , double off [ ] , int numCols ) { reset ( numCols ) ; this . diag = diag ; this . off = off ; }
Sets up and declares internal data structures.

@param diag Diagonal elements from tridiagonal matrix. Modified.
@param off Off diagonal elements from tridiagonal matrix. Modified.
@param numCols number of columns (and rows) in the matrix.