question: private boolean isPrimalFeasible ( ) { double [ ] x = row ( ) ; double sum = 0.0 ; for ( int j = 0 ; j < n ; j ++ ) { if ( x [ j ] < 0 ) { StdOut . println ( "row vector not a probability distribution" ) ; StdOut . printf ( "    x[%d] = %f\n" , j , x [ j ] ) ; return false ; } sum += x [ j ] ; } if ( Math . abs ( sum - 1.0 ) > EPSILON ) { StdOut . println ( "row vector x[] is not a probability distribution" ) ; StdOut . println ( "    sum = " + sum ) ; return false ; } return true ; }
target:  The code below is solely for testing correctness of the data type.