static Frame filterOutNAsInColumn(Frame fr, int columnIndex) {
    Frame noNaPredicateFrame = new IsNotNaTask().doAll(1, Vec.T_NUM, new Frame(fr.vec(columnIndex))).outputFrame();
    return selectByPredicate(fr, noNaPredicateFrame);
  }
static Frame filterOutNAsInColumn ( Frame fr , int columnIndex ) { Frame noNaPredicateFrame = new IsNotNaTask ( ) . doAll ( 1 , Vec . T_NUM , new Frame ( fr . vec ( columnIndex ) ) ) . outputFrame ( ) ; return selectByPredicate ( fr , noNaPredicateFrame ) ; }
@return frame without rows with NAs in `columnIndex` column