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Jerome,
yes you're right, if I do an explore on all data
with
for(i=0;i<BarCount;i++)
{
if(mo[i])
test[i] = 1;
else
test[i]=0;
}
AddColumn(test,"test");
AddColumn(mo,"mo");
AddTextColumn(Name(),"Ticker",1.0);
I have got correct results
but If I ask
for(i=0;i<BarCount;i++)
{
if(!mo[i]) // NOT mo
test[i] = 1;
else
test[i]=0;
}
I have incorrect results
stephane
> Further step in this "Null" problem : I have inserted a "NZ()"
function in
> the code example. And it appears that this function doesn't convert
the
> first 5 bars of the mo array in 0 values. So, the values initialy
present in
> those first 5 bars are not Null/Nan/Infinity values. So what are
they ? And
> how can we test them ?
>
> Hereafter is the modified code example :
>
> mo = MA(C,5);
>
> Nz(mo);
>
> test = 0;
>
> for(i=0;i<BarCount;i++)
>
> {
>
> if(mo[i] == Null) test[i] = 1;
>
> }
>
> AddColumn(test,"test");
>
> AddColumn(mo,"mo");
>
> Filter = 1;
>
>
>
> -----Message d'origine-----
> De : Silvarius [mailto:silvarius@x...]
> Envoyé : vendredi 28 novembre 2003 19:32
> À : amibroker@xxxxxxxxxxxxxxx
> Objet : RE: [amibroker] Re: Null constant
>
>
> stéphane,
>
> The problem is not at the end of the loop, but at the beginning,
where the
> 5 first bars are supposed to hold a "Null" value, and are not
reported as
> such in the "if" test.
>
> Normaly, in the code example, the mo array is calculated as :
>
> mo[0] = Null
> mo[1] = Null
> ...
> mo[4] = Null
> mo[5] = number
> mo[6] = number
> ...
> mo[BarCount - 1] = number
>
> So why does the test "mo[0] == Null" return a "false" result ?
>
> Your test (mo[i] > 0) returns a "true" result for any bar holding
a number
> value and a "false" result for the first five bars holding a Null
value. But
> the inverse test (mo[i] <=0) returns a false result for every bar.
I would
> like a test that returns "true" for the first bars holding Null
values, and
> "false" for all the other bars holding number values.
>
> We can of course use the array generated by your test, and buid a
new one
> by inversing the 0 and the 1, but I would like to understand why I
can't
> test directly a Null value in a for loop.
>
> Friendly yours, Jérôme.
> -----Message d'origine-----
> De : Stephane Carrasset [mailto:nenapacwanfr@x...]
> Envoyé : vendredi 28 novembre 2003 17:34
> À : amibroker@xxxxxxxxxxxxxxx
> Objet : [amibroker] Re: Null constant
>
>
> jerome,
>
> à la fin de l'execution de la boucle ( barcount-1)
> mo[i] ne sera jamais null sauf si une valeur a 4 jours de data
> aussi test[i] ne donne jamais 1 mais zero.
> fais une explore avec
> for(i=0;i<BarCount;i++)
> {
> if(mo[i] >0 )
> test[i] = 1;
> }
>
> stephane
>
>
>
> > Hello,
> >
> > Until yet, I have not succeeded in using the "Null" constant
in for
> loops.
> > In the simple following code, I would have expected the first
5
> bars of the
> > "test" array to hold a "1" value. This is not the case, so the
> expression
> > (mo[i] == Null) does not return a true result even when the MA
(C,5)
> doesn't
> > return any value. Is this by design or do I use this constant
in a
> wrong way
> > ?
> >
> > Thank you in advance for any piece of help.
> >
> > Best regards, Jérôme ULRICH
> >
> >
> > -------------------------
> > mo = MA(C,5);
> >
> > test = 0;
> >
> > for(i=0;i<BarCount;i++)
> >
> > {
> >
> > if(mo[i] == Null) test[i] = 1;
> >
> > }
> >
> > AddColumn(test,"test");
> >
> > AddColumn(mo,"mo");
> >
> > Filter = 1;
> >
> > --------------------------
>
>
>
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