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Duxx
Posts: 881
Joined: 2/18/2009
 User Profile |
I feel dumb asking this question that by now I should probably know.
I have written an Olang Indicator and I want to scan with it. I tried to scan but it returns 0. And by hand I know there must be at least 100 occurences of that indicator.
I have basically written in the scan somehing along this lines:
IndOGMarket(4,65)>2
Thank you
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Jim Dean
Posts: 3433
Joined: 3/13/2006
Location: L'ville, GA
User Profile |
The value that the indicator plots must be Returned also.
#Indicator
Dim myval as single
Myval = SMA(6)
Plotprice("SMA",myval)
Return myval
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Duxx
Posts: 881
Joined: 2/18/2009
User Profile |
Hello Jim,
I think I have it that way:
#Indicator
#param "CurrATRpds", 15
#param "HistATRpds", 660
Dim RatioHistVol as Single
If Symboldata.Numrec - 1 < HistATRpds then
RatioHistVol = ATR(CurrATRpds) / ATR(Symboldata.Numrec - 1)
Else
RatioHistVol = ATR(CurrATRpds) / ATR(HistATRpds)
End If
Plot( "HistVol", RatioHistVol )
PlotLabel(2)
Return RatioHistVol
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Jim Dean
Posts: 3433
Joined: 3/13/2006
Location: L'ville, GA
User Profile |
Use "bar" instead of symboldata.numrec-1
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Duxx
Posts: 881
Joined: 2/18/2009
User Profile |
Hi Jim
Strangely, still giving me a zero after the change to bar. But Im sure there are many stocks that can be scan with that indicator.
Thx
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Jim Dean
Posts: 3433
Joined: 3/13/2006
Location: L'ville, GA
User Profile |
Post your revised code please.
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Duxx
Posts: 881
Joined: 2/18/2009
User Profile |
Hi Jim
I think I made a mistake but not on my computer right now to test. I left the -1 after bar - I should have just input bar - will test and post again once I get to the computer.
Thank you Jim
Here is what I input last night:
#Indicator
#param "CurrATRpds", 15
#param "HistATRpds", 660
Dim RatioHistVol as Single
If bar - 1 < HistATRpds then
RatioHistVol = ATR(CurrATRpds) / ATR(bar - 1)
Else
RatioHistVol = ATR(CurrATRpds) / ATR(HistATRpds)
End If
Plot( "HistVol", RatioHistVol )
PlotLabel(2)
Return RatioHistVol
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Jim Dean
Posts: 3433
Joined: 3/13/2006
Location: L'ville, GA
User Profile |
Remove both -1's.
And also wrap the whole thing in
If bar > curratrpds then
… stuff
End if
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Duxx
Posts: 881
Joined: 2/18/2009
User Profile |
Hi Jim
I erased the -1
Not sure I understand what you mean to wrap up the whole thing - Do you mean this?
Thank you for bearing with me
#Indicator
#param "CurrATRpds", 15
#param "HistATRpds", 660
Dim RatioHistVol as Single
If bar < HistATRpds then
RatioHistVol = ATR(CurrATRpds) / ATR(bar)
Else
RatioHistVol = ATR(CurrATRpds) / ATR(HistATRpds)
End If
Plot( "HistVol", RatioHistVol )
PlotLabel(2)
Return RatioHistVol
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Jim Dean
Posts: 3433
Joined: 3/13/2006
Location: L'ville, GA
User Profile |
Try this (not tested, from iPhone):
#Indicator
#param "CurrATRpds", 15
#param "HistATRpds", 660
Dim RatioHistVol as Single
If bar >= CurrATRpds then
If bar < HistATRpds then
RatioHistVol = ATR(CurrATRpds) / ATR(bar)
Else
RatioHistVol = ATR(CurrATRpds) / ATR(HistATRpds)
End If
Plot( "HistVol", RatioHistVol )
PlotLabel(2)
End if
Return RatioHistVol
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Duxx
Posts: 881
Joined: 2/18/2009
User Profile |
Hi Jim,
It continue to show zero on the scan.
 Attached file : 12-9-2011 2-29-42 PM.png (6KB - 755 downloads)
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Jim Dean
Posts: 3433
Joined: 3/13/2006
Location: L'ville, GA
User Profile |
Check the value being used, by assigning that function to a custom focus list column.
There was an issue reported quite a while ago, where OScan was improperly interpreting some OLang functions. I *thot* it had been fixed.
Try using the "US Stocks" list for the scan. If your FL column shows a value for any symbols that is <= 1.5, and the scan does not show those symbols, you need to snapshot both screens, and bundle them with your code in a bug report.
Also it would probably be useful to show a few snaps of charts of symbols for which the plot shows <= 1.5 but the symbol does not show up in the scan.
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Duxx
Posts: 881
Joined: 2/18/2009
User Profile |
Thank you Jim
I posted them into the tech support folder.
Have a nice weekend
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This accout has been deleted
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I have a custom indicator that I want to use in an omniscan. What is the correct syntax?
myIndicator()?
myIndicator(Return)?
myIndicator(variable)?
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Jim Dean
Posts: 3433
Joined: 3/13/2006
Location: L'ville, GA
User Profile |
Myindicator(Param,param,…) depending on how many #param stmts your Indic has. It will return the Return value to the script.
If your Indic has no param's then use ()
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THOMAS HELGET
Posts: 610
Joined: 3/22/2006
Location: BALDWINSVILLE, NEW YORK
User Profile |
Don:
In the OmniScan you also have to provide some sort of Boolean information in relation to the values the Indicator is "Return"ing (usually that last line in your Indicator) such as:
MyIndicator(Param, Param, ....) > 5 Or
MyIndicator() = 7
I hope that further clarifies things.
Tom Helget
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Jim Dean
Posts: 3433
Joined: 3/13/2006
Location: L'ville, GA
User Profile |
Tom is correct that is the "normal" way for a scan to be structured.
However, if the Return value from the called function is itself a true/false flag, no other Boolean operators or syntax are needed.
That is, if myindicator() returns 0, it is interpreted as "false" … if it returns -1 (or any other nonzero value), it is interpreted as "true".
Or you can combine it (as a T/F value) with other logical conditions, such as:
myindicator() And Sma(V,50) > 1e5
Click here for a pretty extensive explanation about how and why the zero and nonzero answers are treated as false and true, plus a bunch of other interesting (to some people :-) factoids regarding Boolean math in OLang and OScript.
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