public Complex contraction() {
        int i, j;
        Complex result = new Complex(0d, 0d);
        for (i = 0; i < rows; i++)
            for (j = 0; j < columns; j++) {
                result.real += realmatrix[i][j];
                result.imag += imagmatrix[i][j];
            }
        return result;
    }
public Complex contraction ( ) { int i , j ; Complex result = new Complex ( 0d , 0d ) ; for ( i = 0 ; i < rows ; i ++ ) for ( j = 0 ; j < columns ; j ++ ) { result . real += realmatrix [ i ] [ j ] ; result . imag += imagmatrix [ i ] [ j ] ; } return result ; }
Calculates the contraction from a matrix