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<FONT face=Arial color=#0000ff
size=2>stéphane,
<FONT face=Arial color=#0000ff
size=2>
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.
<FONT face=Arial color=#0000ff
size=2>
<FONT face=Arial color=#0000ff
size=2>Normaly, in the code example, the mo array is calculated as
:
<FONT face=Arial color=#0000ff
size=2>
mo[0]
= Null
mo[1]
= Null
<FONT face=Arial color=#0000ff
size=2>...
mo[4]
= Null
mo[5]
= number
mo[6]
= number
<FONT face=Arial color=#0000ff
size=2>...
<FONT face=Arial color=#0000ff
size=2>mo[BarCount - 1] = number
<FONT face=Arial color=#0000ff
size=2>
So why
does the test "mo[0] == Null" return a "false" result ?
<FONT face=Arial color=#0000ff
size=2>
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.
<FONT face=Arial color=#0000ff
size=2>
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.
<FONT face=Arial color=#0000ff
size=2>
<FONT face=Arial color=#0000ff
size=2>Friendly yours, Jérôme.
<FONT face=Tahoma
size=2>-----Message d'origine-----De : Stephane Carrasset
[mailto:nenapacwanfr@xxxxxxxxx]Envoyé : vendredi 28 novembre
2003 17:34À : amibroker@xxxxxxxxxxxxxxxObjet :
[amibroker] Re: Null constantjerome,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 dataaussi test[i] ne donne jamais 1 mais
zero.fais une explore avecfor(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;> > --------------------------Send
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