如何標示近5日的最高價與最低價

小幫手您好，我寫了一個指標來標示近5日每天的最高價與最低價，假如價格超出個股今天的漲跌停範圍就不顯示。但我這個寫法好像有點土法煉鋼，而且要增減天數也很不方便。請問您有沒有什麼方法可以優化這個指標呢？

if highD(1) <= closeD(1)*1.1
and highD(1) >= closeD(1)*0.9
and Date=currentDate
then plot1(highD(1),"前1天最高價");

if highD(2) <= closeD(1)*1.1
and highD(2) >= closeD(1)*0.9
and Date=currentDate
then plot2(highD(2),"前2天最高價");

if highD(3) <= closeD(1)*1.1
and highD(3) >= closeD(1)*0.9
and Date=currentDate
then plot3(highD(3),"前3天最高價");

if highD(4) <= closeD(1)*1.1
and highD(4) >= closeD(1)*0.9
and Date=currentDate
then plot4(highD(4),"前4天最高價");

if highD(5) <= closeD(1)*1.1
and highD(5) >= closeD(1)*0.9
and Date=currentDate
then plot5(highD(5),"前5天最高價");

if lowD(1) <= closeD(1)*1.1
and lowD(1) >= closeD(1)*0.9
and Date=currentDate
then plot6(lowD(1),"前1天最低價");

if lowD(2) <= closeD(1)*1.1
and lowD(2) >= closeD(1)*0.9
and Date=currentDate
then plot7(lowD(2),"前2天最低價");

if lowD(3) <= closeD(1)*1.1
and lowD(3) >= closeD(1)*0.9
and Date=currentDate
then plot8(lowD(3),"前3天最低價");

if lowD(4) <= closeD(1)*1.1
and lowD(4) >= closeD(1)*0.9
and Date=currentDate
then plot9(lowD(4),"前4天最低價");

if lowD(5) <= closeD(1)*1.1
and lowD(5) >= closeD(1)*0.9
and Date=currentDate
then plot10(lowD(5),"前5天最低價");