How do I get IsRising / IsFalling from previous bars?

[timmbbo]

Hi there, how can I get the IsRising Value, from previous bars? That is, I can do:

Print("The val is " + SMA(20)[5]);
Print("Is Rising is " + IsRising(SMA(20)));

But, when I attempt to combine both of these:

Print("Is rising 5 bars ago is " + IsRising(SMA(20))[5]);

Then I get an overloaded error. How can I perform IsRising, beyond the current bar?

Thanks

[bltdavid]

I don't think you can.

You could create a Series<bool> and keep track of the value of every
IsRising result on every bar, but that seems like overkill.

I suggest you roll your own IsRising method, something like this,

private bool IsRising(ISeries<double> ds, int startBarsAgo, int lookback)
{
    if (lookback < 1)
        throw new ArgumentException("Lookback cannot be zero or negative");

    if (CurrentBar < startBarsAgo+lookback)
        return false;

    int nGood = 0;
    for (int barsAgo = startBarsAgo, cnt = 0; cnt < lookback; ++cnt, ++barsAgo)
        if (ds[barsAgo] > ds[barsAgo+1])
            ++nGood;

    return nGood == lookback;
}
​

[Because my method signature is different than the builtin signature (my 3 args
to the builtin version's 1 arg), reusing the name 'IsRising' is a great example of
'method overloading'. The point is: when a method name is perfect, why use a
different name when you don't have to? That is, 'IsRising' is also a great name
for my method, so by using method overloading, I can use the same name as
the builtin method. The only caveat is that someday NT engineers may want to
expose their own overloaded method using same signature as mine. No prob,
if that were to happen, we'd get a compiler error, and then we'd be forced to
change our method signature, or change our method name. So, until then ...]

Using my overloaded method is pretty simple.

The builtin IsRising(SMA(20)) is equivalent to IsRising(SMA(20), 0, 1).

To get the 5th BarsAgo value of IsRising, you'd use IsRising(SMA(20), 5, 1).

If you want to know if IsRising is true over the last 5 bars, use IsRising(SMA(20), 0, 5).

Enjoy!

[NinjaTrader_BrandonH]

Hello timmbbo,

Thanks for your notes.

bltdavid is correct. Since IsRising() and IsFalling() do not have a barsAgo parameter available to pass into these methods, the value for previous bars is not accessible.

IsRising(): https://ninjatrader.com/support/help...nt8/rising.htm
IsFalling(): https://ninjatrader.com/support/help...t8/falling.htm

You may consider using the workarounds that bltdavid shared to accomplish your goal.

Please let me know if I may assist further.