Plot0.Set(Close[0]); vs Plot0.Set(Close[1]);

[amedhussaini]

I'm very new to Ninjascripting.. encountered a problem in 1 minute of attempting my first script!

Why does

Plot0.Set(Close[0]);

plot a line appopriately but

Plot0.Set(Close[1]);

plot nothing at all? Shouldn't the latter plot a line tracing the previous close?

Thanks!

[roonius]

I'm very new to Ninjascripting.. encountered a problem in 1 minute of attempting my first script!

Why does

Plot0.Set(Close[0]);

plot a line appopriately but

Plot0.Set(Close[1]);

plot nothing at all? Shouldn't the latter plot a line tracing the previous close?

Thanks!


Add the following line:
if(CurrentBar == 0) return;

[amedhussaini]

thank you, makes sense. before, it was stuck waiting for the previous bar before drawing everything?

[amedhussaini]

ACtually, makes me a bit more confused:

This works:

if(CurrentBar == 0) return;
Plot0.Set( Close[1]);

but now this doesn't work:

if(CurrentBar == 0) return;
Plot0.Set( Close[2]);

[roonius]

ACtually, makes me a bit more confused:

This works:

if(CurrentBar == 0) return;
Plot0.Set( Close[1]);

but now this doesn't work:

if(CurrentBar == 0) return;
Plot0.Set( Close[2]);


try
if (CurrentBar < 2) return;

you have to make sure you have enough bars before referencing them

[amedhussaini]

i think i get it now..

whenever i reference a set number of bars in the past, i have to make sure that i stop trying to calculate it if there aren't enough bars left on the chart before i get to bar[0]...

otherwise it will hang.. and continually wait for a new bar

[roonius]

i think i get it now..

whenever i reference a set number of bars in the past, i have to make sure that i stop trying to calculate it if there aren't enough bars left on the chart before i get to bar[0]...

otherwise it will hang.. and continually wait for a new bar

Calculation starts from the very first bar on your chart (leftmost).
If the bar is first on chart, you are trying to access the bar before it which does not exist.

[amedhussaini]

thanks, makes even more sense now that i'm looking at it starting left to right