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Thanks for the replies. The example of cum(5) = 5 helps as I see
the parameter is the increment?
This is the full code I was trying to understand: (it's Linda
Bradfords - Anti Indicator)
{long}
setbars:=3;
entryadd:=1;
ff:=Mov(Stoch(7,1),3,E);
ss:=Mov(Mov(Stoch(16,1),3,E),3,E);
cbuy:=If(ff<=Ref(ff,-1) AND ss>=Ref(ss,-1),Cum(1),0);
bbuy:=If(cbuy>=setbars,H+entryadd, 99999);
bbuy<99999
Hence why I didn't understand why you would want to just accumlate
the periods, like if it was period 100, 101, 103 etc as the test
where cbuy >=3(setbar) seems strange as cum(1) will always be
greater once we have more than 3 days (so the setbar seems
unnecessary) unless as per your example where a mod functions was
used to reset the sequence.
David
--- In equismetastock@xxxxxxxxxxxxxxx, "MG Ferreira" <quant@xxxx>
wrote:
>
> Again, there is a bug in the code I posted previously. I have to
> sincerely apologise - it seems each time I reread a posting I pick
up
> some errors in it! Please do accept my apologies.
>
> The mod function's arguments have to be swapped around, as follows:
>
> c = mod(cum(1)-1,n)
>
> to create a cycle of length 'n' and the example becomes
>
> c = mod(cum(1)-1,10)
>
> to create a cycle of length 10.
>
> Regards
> MG Ferreira
> TsaTsa EOD Programmer and trading model builder
> http://www.ferra4models.com
> http://fun.ferra4models.com
>
>
> --- In equismetastock@xxxxxxxxxxxxxxx, "MG Ferreira" <quant@xxxx>
wrote:
> >
> > Oops, just change
> >
> > C1(1) = 0
> >
> > to
> >
> > C1(1) = 1
> >
> > We often use
> >
> > cum(1) - 1
> >
> > which yields of course 0, 1, 2, ...
> >
> > This makes some of the math a lot easier, especially if you use
mods,
> > which is very useful in cyclical analysis. If you have something
> > like
> >
> > c = mod(n,cum(1)-1)
> >
> > then c will be 0, 1, 2, ... n-1. Say you want to look at a
cycle of
> > length 10, then
> >
> > mod(10,cum(1)-1)
> >
> > will give 0, 1, 2 ... 9, 0, 1, 2 ... 9, 0, 1 and so on.
> >
> > Regards
> > MG Ferreira
> > TsaTsa EOD Programmer and trading model builder
> > http://www.ferra4models.com
> > http://fun.ferra4models.com
> >
> >
> > --- In equismetastock@xxxxxxxxxxxxxxx, "MG Ferreira"
<quant@xxxx> wrote:
> > >
> > > OK, this is just on the example specifically - see Roy's reply
as
> > > well for better examples of using the cum(1) function.
> > >
> > > > buy:=If (some boolean test),cum(1),0)
> > > >
> > > > Does this mean it's like this
> > > > If TRUE then
> > > > buy = buy + 1;
> > > > else
> > > > buy = 0;
> > >
> > > This is actually NOT what the MS statement does. It starts off
> > > by creating a time series that accumulates by 1 each bar. Let
us
> > > call this C1 to clarify, say
> > >
> > > C1 = cum(1)
> > >
> > > so
> > >
> > > C1(1) = 0
> > >
> > > and
> > >
> > > C1(t) = C1(t-1) + 1
> > >
> > > or, simply,
> > >
> > > C1 = 1, 2, 3, 4 ....
> > >
> > > Note (this is sometimes useful) if you had something like
> > >
> > > C2 = cum(5)
> > >
> > > then
> > >
> > > C2 = 5, 10, 15, 20 ...
> > >
> > > Now, what that MS line of code you gave does, is to switch
between
> > > either zero or C1. So if you are at time period 100, and
previously
> > > the boolean test was false, but now is true, that function
will return
> > > 100, then 101, 102 ..., and not 1, 2, 3 ... as your code
implies. So
> > > maybe the code should be
> > >
> > > increment c1 REGARDLESS
> > > if true then
> > > result = c1
> > > else
> > > result = zero
> > >
> > > Regards
> > > MG Ferreira
> > > TsaTsa EOD Programmer and trading model builder
> > > http://www.ferra4models.com
> > > http://fun.ferra4models.com
> > >
> > >
> > > --- In equismetastock@xxxxxxxxxxxxxxx, "dpleydel"
<dpleydel@xxxx>
> wrote:
> > > >
> > > >
> > > > Hi
> > > >
> > > > I've looked at the primer but I still don't quite get what
this
> > > > function is doing.
> > > >
> > > > for example I've seen it used in a this this regard:
> > > >
> > > > buy:=If (some boolean test),cum(1),0)
> > > >
> > > > Does this mean it's like this
> > > > If TRUE then
> > > > buy = buy + 1;
> > > > else
> > > > buy = 0;
> > > >
> > > > Thanks
> > > > David
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