Can't access Times[0][idx] with idx > 0

[dominikstiffel]

Hey,

I am using this code:

var times = Times[0];
Print($"Printing all times from 0 to {times.Count - 1}:");
for (int i = 0; i < times.Count; i++) {
    Print($"times[{i}] = {times[i]}");
}

But get this exception:

DoRpc: got Exception: System.ArgumentOutOfRangeException: 'barsAgo' needed to be between 0 and 5473 but was 1
Parameter name: barsAgo
at NinjaTrader.NinjaScript.TimeSeries.get_Item(Int32 barsAgo)

What am I doing wrong?

[bltdavid]

Where is this code located?
Inside OnBarUpdate?

Your code should probably be using CurrentBar, not Count.

As you know ...
OnBarUpdate is called every time each bar closes.

On the first call to OnBarUpdate, there is only one
bar to look at -- the first bar.

On the second call to OnBarUpdate, there are 2 bars,
etc, etc.

On the first call to OnBarUpdate, the value of CurrentBar
is 0 but Count is 5473 (I assume, according to the error
message).

That's right, on the very first bar, Count is already some
huge ass number -- it represents all the historical bars
that have been loaded. But those historical bars are
processed later one at a time, one bar for each call
to OnBarUpdate.

When using BarsAgo indexing to access previous bars,
your code must respect the value of CurrentBar. Count
does not do that, it serves a different purpose, and is
generally not used with BarsAgo indexes.

You can't look at all 5473 bars (with BarsAgo indexing)
until OnBarUpdate has been called 5473 times, once for
each bar.

In other words,
Despite the value of Count, you cannot access a bar using
BarsAgo indexing until that bar has been processed by the
call to OnBarUpdate. If you do, you'll get an out of range
error.

For an even better explanation, attach your script so that
we have better context.

[NinjaTrader_ChelseaB]

Hello dominikstiffel,

I think you want to be looping from 0 to CurrentBar.

Try the following:

for (int i = 0; i < CurrentBar; i++) {
Print($"Times[0][{i}] = {Times[0][{i}]");
}