Not able to pass double to method

[TargetFilledTrading]

Hello, I am sorry as this is probably an extremely easy and dumb question but I have been pulling my hair out for 2 days. I am trying to calculate a value with OBV() and pass it to another study but the study takes an int.

Here is the code:

double obv = OBV()[0];
double obvEma = EMA(obv, 12);

I have tried quite a bit to get the value of obv into the first parameter of EMA but I just cant seem to get it.

What confuses me even more is that I have done it in another section of my code:
ISeries<double> mom0 = Momentum(Close, Momentum_length);
ISeries<double> mom1 = Momentum(mom0, 1);

I am getting errors ranging from CS1502, CS0029 and others.

Thanks for your help!

[bltdavid]

Hello, I am sorry as this is probably an extremely easy and dumb question but I have been pulling my hair out for 2 days. I am trying to calculate a value with OBV() and pass it to another study but the study takes an int.

Here is the code:

double obv = OBV()[0];
double obvEma = EMA(obv, 12);

I have tried quite a bit to get the value of obv into the first parameter of EMA but I just cant seem to get it.

What confuses me even more is that I have done it in another section of my code:
ISeries<double> mom0 = Momentum(Close, Momentum_length);
ISeries<double> mom1 = Momentum(mom0, 1);

I am getting errors ranging from CS1502, CS0029 and others.

ISeries<double> obv = OBV();
ISeries<double> obvEma = EMA(obv, 12);

or

OBV obv = OBV();
EMA obvEma = EMA(obv, 12);

[TargetFilledTrading]

ISeries<double> obv = OBV();
ISeries<double> obvEma = EMA(obv, 12);

or

OBV obv = OBV();
EMA obvEma = EMA(obv, 12);

Thank you for the help! The first one works and compiles however I am not able to use a future operand on the variable for comparison.

I ended up figuring out an alternative that allows the convert to int to work.

int obv = Convert.ToInt32(OBV()[0]);
double obvEma = EMA(obv)[0];

[QuantKey_Bruce]

No, you can't do EMA of an int that is not a series. You should do it like bltdavid suggested above. The first argument to EMA() has to be a series - it cannot be just a single scalar value.

[bltdavid]

ISeries<double> obv = OBV();
ISeries<double> obvEma = EMA(obv, 12);

or

OBV obv = OBV();
EMA obvEma = EMA(obv, 12);

After obv and obvEma are defined, per above, you can then
use '[n]' indexing to access individual values on a 'BarsAgo' basis,

Print("obv[0]="+obv[0]);
Print("obvEma[0]="+obvEma[0]);

-=o=-

You said,
"I am not able to use a future operand on the variable for comparison"

Are you referring to the ability to add an indexer? That is, when you
append the '[0]' suffix, like for an array?

Otherwise, sorry, no idea what that means ...

[TargetFilledTrading]

No, you can't do EMA of an int that is not a series. You should do it like bltdavid suggested above. The first argument to EMA() has to be a series - it cannot be just a single scalar value.

Interesting, it compiled and worked? I thought EMA could take an int arg or a series double? both would work from what I interpreted from the documentation? Thanks for the extra help!

[QuantKey_Bruce]

What it's doing when you send it an int argument is treating it as the length, and doing an EMA of the default input which is Close.

You indicated above that you were trying to do an EMA of OBV, so that would not be what you appeared to be wanting.

Yes, it compiles, but it is not going to give you what you appeared to be trying to get.

[TargetFilledTrading]

After obv and obvEma are defined, per above, you can then
use '[n]' indexing to access individual values on a 'BarsAgo' basis,

Print("obv[0]="+obv[0]);
Print("obvEma[0]="+obvEma[0]);

-=o=-

You said,
"I am not able to use a future operand on the variable for comparison"

Are you referring to the ability to add an indexer? That is, when you
append the '[0]' suffix, like for an array?

Otherwise, sorry, no idea what that means ...

Thank you again bltdavid! Sorry I should have been more clear. Later in my logic for trade entries, I am comparing values of the variables saying something like:
IF obv > obvEma then foo

But when I used your way that logic failed for some reason.

[TargetFilledTrading]

What it's doing when you send it an int argument is treating it as the length, and doing an EMA of the default input which is Close.

You indicated above that you were trying to do an EMA of OBV, so that would not be what you appeared to be wanting.

Yes, it compiles, but it is not going to give you what you appeared to be trying to get.

Oooooohhh, I understand now. Thank you for explaining it so clearly, I appreciate that!

[NinjaTrader_BrandonH]

Hello TargetFilledTrading,

Thanks for your post.

bltdavid and QuantKey_Bruce are correct. The first argument for EMA() must be a Series and cannot be an int value as seen in the EMA() help guide syntax.

EMA(ISeries<double> input, int period)

EMA(): https://ninjatrader.com/support/help...onential_e.htm

After defining obv and EMA, you could access values by supplying a BarsAgo index value. Using a BarsAgo index of [0] means you would be accessing the current bar's value. Using a BarsAgo index of [1] means you would be accessing the previous bar's value, and so on.