Drawing an Indicator only During Today

[lazar223@xxxxxxxxxxx]

Hello all! Would someone illustrate how to modify an indicator such that
it only charts in today's chart. For example, how would you address the
Keltner Channel?
Thanks in advance.

Inputs: Price(Close),MALen(10),Const(.8);
Vars: CentLine(0), AvgRange(0), Upper(0), Lower(0);

CentLine=Average(Price,MALen);
AvgRange=Average(TrueRange,MALen);
Upper=CentLine+(AvgRange*Const);
Lower=CentLine-(AvgRange*Const);

Plot1(CentLine,"CentLine");
Plot2(Upper,"Upper");
Plot3(Lower,"Lower");