plotK有沒有辦法延長?

我想寫只發行5天的可轉債的現股的60日均線  請問有辦法讓他正常顯示嗎?

Var:_h(0),_l(0),_o(0),_c(0);

_h=getsymbolfield("underlying","h");

_l=getsymbolfield("underlying","l");

_o=getsymbolfield("underlying","o");

_c=getsymbolfield("underlying","c");

value9=getField("轉換價格");

plotk(99,_o,_h,_l,_c,"標的物");

plot1(value9,"轉換價格");

var:_v(0);

_v=getsymbolfield("underlying","v");

if _c>_o then plot2(_v,"成交量") else plot3(_v,"成交量");

plot9(_v*4,"x");