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Hi,
I would like to pass variables instead of constants for box size in P&F for my testing in the ExtFml("PointFig.pointfig",.....) function.
Ideas are welcome.
thanks
-kalyan
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Rank: Advanced Member
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Hi Kalyan
Use this expression as your constant.
LastValue(MyVariable+PREV-PREV), or the slightly shorter and slightly slower version
LastValue(MyVariable+PREV*0).
Roy
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Rank: Member
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Joined: 12/21/2009(UTC)
Posts: 10
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Roy,
Thanks a ton, works fine. As I assumed due to "PREV" the explorations are slow but it is ok.
Thanks again
-kalyan
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Rank: Member
Groups: Registered, Registered Users
Joined: 12/21/2009(UTC)
Posts: 10
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Roy,
I tried passing lastvalue(fml(boxsize)), where I wrote the code for box size without the PREV functions and it works fine and fast.
Any particular reason you suggested PREV
Thanks
-kalyan
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Rank: Advanced Member
Groups: Registered, Registered Users, Subscribers
Joined: 7/25/2005(UTC)
Posts: 1,042
Was thanked: 57 time(s) in 54 post(s)
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Hi Kalyan
LastValue() converts a variable into a constant. Unfortunately it also fulfills its primary purpose at the same time and returns just one (constant) value across all data. That's fine for an exploration where the last value is all that you're interested in, but it's not particularly helpful if used in an indicator, expert or system.
LastValue(MyVariable+PREV-PREV) is a curious mix of code that uses features of both LastValue() and PREV to create a variable that MetaStock will accept as a constant.
This curious mix is the same piece of code that Equis have used to create the MetaStock 11 adaptive functions. Unfortunately they used three times as many PREVs as really necessary making them very slow. There's also a problem where the values returned by the adaptive functions are "off" by a small amount every few bars. The March 2010 issue of MSTT has revised code for about 80% of those functions that eliminates PREV and the "off" values while speeding up execution.
Roy
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Rank: Member
Groups: Registered, Registered Users
Joined: 12/21/2009(UTC)
Posts: 10
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Hi roy
Great input, I noticed the expert and there were changes if don't use the PREV, so I have modified experts and indicators to have PREV. I really appreciate your help.
Thanks
-kalyan
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