REF problem - Centering a simple average

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REF problem - Centering a simple average - REF problem - Centering a simple average

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jjstein		#1 Posted : Thursday, May 22, 2008 6:36:31 PM(UTC)
Rank: Advanced Member Groups: Registered, Registered Users, Subscribers Joined: 5/13/2005(UTC) Posts: 715 Location: Midwest, USA Was thanked: 1 time(s) in 1 post(s)		I'm trying to plot a simple moving average, centered properly. The following comes close: Speed:= Input("MA",1,500,80); Displacement:=Speed/2; MA:=Mov(C,Speed,S); Ref(MA,Displacement); To do it properly, the period and displacement need to be an odd number, so I've coded an automatic adjustment: Speed:= Input("MA",1,500,80); Speed:=If(Mod(Speed,2)=0,Speed+1,Speed); MA:=ExtFml("FORUM.Mov",C,Speed,S); Displacement:=If(Mod(Speed,2)=0,Speed/2,(Speed+1)/2); ExtFml("Forum.REF",MA,-Displacement); However, the adjustment means that the FORUM.DLL needs to be used for both the Moving Average and the use of REF for a horizontal shift (like the built-in M.A.). It "sort of" works, BUT the FORUM.DLL plot drops down to zero, instead of stopping! Anyone have an idea on how to fix this?


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wabbit		#2 Posted : Thursday, May 22, 2008 6:54:24 PM(UTC)
Rank: Advanced Member Groups: Registered, Registered Users, Subscribers, Unverified Users Joined: 10/28/2004(UTC) Posts: 3,111 Location: Perth, Western Australia Was thanked: 16 time(s) in 16 post(s)		jj, The Forum functions allow the user to pass data arrays as arguments, but you only need to "convert" the user input speed as a variable to a "static" value for use in the normal moving average and ref functions. Code: `Speed:=Input("MA",1,500,80); Speed:=LastValue(If(Mod(Speed,2)=0,Speed+1,Speed)); Displacement:=Speed/2; MA:=Mov(C,Speed,S); {plot} Ref(MA,-Displacement);` Hope this helps. wabbit [:D]


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