RE: [amibroker] Static Variables

["Herman van den Bergen" <psytek@xxxxxxxx>]

<FONT face=Arial color=#0000ff 
size=2>Ara,
<FONT face=Arial color=#0000ff 
size=2> 
You 
have to be careful scoping the Static Variables, 
<FONT face=Arial color=#0000ff 
size=2> 
1) If 
you use same name static variables in different indicators then their values can 
change from various sources. This is the case if you assign program derived 
values, for example counters ,not in the case of param() see 
next...
<FONT face=Arial color=#0000ff 
size=2> 
2) If 
the Static variables are initialized inside the code with a Param() in EACH of 
the Indicators then in essence you have disabled the Global nature of the 
Static Variable: this is so because the Static variable is reinitialized in 
each Indicator separately each time the code is executed (on Refresh). This 
makes it immune to whatever other code does.
<FONT face=Arial color=#0000ff 
size=2> 
3) 
Static variables are truly Global, in contrast to afl variables declared Global 
in afl, these are Global 'per' indicator. Static variables are Global per 
AmiBroker Instance.
<FONT face=Arial color=#0000ff 
size=2> 
4) If 
you want to restrict the scope of Static variables to the current Indicator, to 
prevnt conflicing conditions, then you have to add a unique identifier to 
each code, I use something like this:

ChartID = <FONT color=#0000ff 
size=2>NumToStr(<FONT color=#0000ff 
size=2>GetChartID(),<FONT color=#ff00ff 
size=2>1.0,False); Reset = <FONT 
color=#0000ff size=2>Param(<FONT color=#ff00ff 
size=2>"Reset Static variables",<FONT color=#ff00ff 
size=2>0,0<FONT 
size=2>,1,<FONT 
color=#ff00ff size=2>1<FONT 
size=2>);StaticScope = Param(<FONT 
color=#ff00ff>"Scope (0:Local,1:Global) for Chart#"+ChartID,<FONT 
color=#ff00ff>1,0,<FONT 
color=#ff00ff>1,1);<FONT 
color=#800000>if( StaticScope ) Scope = <FONT 
color=#ff00ff>""; else<FONT 
size=2> Scope = ChartID;<FONT 
face=Arial>.<SPAN 
class=343574700-09082004>..<FONT 
color=#800000>if<FONT color=#000000 
size=2>( IsEmpty<FONT color=#000000 
size=2>( StaticVarGet<FONT 
color=#000000 size=2>(<FONT color=#ff00ff 
size=2>"TickCounter"<FONT 
color=#000000>+Scope)) OR Reset)<FONT color=#0000ff 
size=2>StaticVarSet(<FONT color=#ff00ff 
size=2>"TickCounter"+Scope,<FONT color=#ff00ff 
size=2>0);TickCount = <FONT 
color=#0000ff size=2>StaticVarGet(<FONT color=#ff00ff 
size=2>"TickCounter"<FONT 
size=2>+Scope);<FONT 
color=#800000>
<SPAN 
class=343574700-09082004><SPAN 
class=343574700-09082004>here a tickcounter is 
made Local to the indicator containing the code to prevent interference with 
duplicate code in other indicators. This means i can count ticks from fifferent 
stocks while using the SAME indicator.
Hope 
this helps,
<SPAN 
class=343574700-09082004>herman.
<FONT face=Arial 
color=#0000ff> 
 
 <FONT 
face=Tahoma size=2>-----Original Message-----From: Ara Kaloustian 
[mailto:ara1@xxxxxxxxxx]Sent: Sunday, August 08, 2004 8:46 
PMTo: AB-MainSubject: [amibroker] Static 
Variables

  I am having a hard time using static 
  variables....
   
  Sometimes they work as expected ... sometimes 
  they don't ... so my expectation must obviously be questionable.
   
  I am assuming Static variables can be used 
  anywhere that normal Number and String variables can be used! 
   
  - in assignments: 
  StaticVarSet("Var",Value);
  - in If Statements: if (StaticVarGet("Var") == 
  Value) ....
  - in iif Statement: Test = 
  iif(StaticVarGet("Var") ==Value,True,False);
   
  Is my assumption correct?
   
  Thanks
   
  AraCheck AmiBroker web 
  page at:<A 
  href="">http://www.amibroker.com/Check 
  group FAQ at: <A 
  href="">http://groups.yahoo.com/group/amibroker/files/groupfaq.html 
  


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