[amibroker] if-else control statement vs IIF function

["Tomasz Janeczko" <amibroker@xxxxxx>]

Hello,
 
It seems that people tend to confuse if-else and IIF. Here is 
some more explanation:
 
if-else is flow control statement. it allows you to change the 
flow of the program (skip some parts of the formula)
 
if( Name() == "MSFT" )
{
   // the special handling for MSFT
   // this part is executed only for MSFT and 
skipped for all other symbols
   Plot( MA( Close, 10 ), "MA10 for Microsoft only", 
colorGreen );
}
 
 
- in this example moving average it plotted ONLY when ticker 
is MSFT. The part in curly braces is skipped
completely if ticker is different.
 
IIF is a FUNCTION that evaluates all arguments always and just 
returns the value of 2nd or 3rd argument
depending on condition (1st argument). There is no way to skip 
any part of the formula using IIF.
 
Also IIF works on ARRAYS while if is a statement that works on 
single TRUE/FALSE value;
 
IIF in fact can be re-implemented using if-else
 
function IIFreimplemented( ConditionArray, TrueArray, 
FalseArray )
{
   for( i = 0; i < BarCount; i++ )
   {
        if( ConditionArray[ i ] 
)
        
{  
           
result[ i ] = TrueArray[ i ];
        } 

        else
        {
<FONT 
size=2>           result[ 
i ] = FalseArray[ i ];
        }
   }
}
 
IIFreimplemented works exactly like built-in IIF.
 
Best regards,Tomasz 
Janeczkoamibroker.com
Best regards,Tomasz 
Janeczkoamibroker.com






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