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That's probably correct given what you are after ... Just be careful
what you put inside the loop .vs. outside and that you only do full
array calc's where necessary ...
I changed your oscillator function ( 10 - 50 ) and I haven't checked
the rest thoroughly, but this should get you close to where you want
to go. Notice I calced n outside the loop as there's no reason for
it to be inside and that some of the calcs inside the loop are not
full array calcs. I did try playing with some things like Sum(X, n
[i]) in place of Cum(X) but there don't appear to be any real time
savings. Exacerbating the problem is that indicator code is
typically run several times. Try running what's below as a plot and
then as an explore and you'll see a noticable difference in how much
clock time is used. There are ways to keep this from happening with
indicators but I forget what they are off the top of my head.
X = (sin(Cum(0.01)) + 2) * 20 - 10;;
n = BarIndex() + 1;
for (i = 0; i < BarCount; i++)
{
CumX = Cum(X);
Mean[i] = CumX[i] / n[i];
Diff = X - Mean[i];
Diff2 = Diff ^ 2;
CDiff2 = Cum(Diff2);
CDiff2n[i] = CDiff2[i] / n[i];
StDevX[i] = sqrt(CDiff2n[i]);
}
Plot(StDevX, "StDevX", colorWhite);
Filter = 1;
AddColumn(StDevX, "StDevX", 1.4);
--- In amibroker@xxxxxxxxxxxxxxx, "treliff" <treliff@xxxx> wrote:
> > That doesn't seem to be relevant as at any given bar a particular
> > Length would be in play for the MA calculated at that bar. There
> > wouldn't appear to be a need to fill an array with the same
> > number ...
>
> Perhaps not in the MA example, but in my particular code there is
> substantial difference between dispersion and min/max values (and
> consequently stdev's) related to Cycle 10 and Cycle 50, so yes, if
> I'm
> currently in Cycle 10-mode, I want stdev calculated strictly over
> Cycle 10's.
>
> > If you'd like to continue this please email me offline ...
>
> You helped me remove the 1st loop, I'm pretty certain I'll
> have to
> live with the 2nd one... Thanks for all your help.
>
> -treliff
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