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IIF() returns arrays, as you said, but perhaps you can just check the last
bar and that you can do with an if(), like
if( IsEmpty(LastValue(Foreign(...)) ) // you can place an array function
here
else // andother array function here
If you data is not always up to date you could check and earlier bar using
subscripts, like C[barcount-10]
best regards,
herman
-----Original Message-----
From: Terry [mailto:MagicTH@xxxxxxxxxxx]
Sent: Monday, October 04, 2004 5:54 PM
To: Amibroker
Subject: [amibroker] IF for arrays?
I have code that I share with other users. Some users have eSignal, some
Yahoo.
One of the indicators in this AFL need the COMPQ loaded as a foreign
symbol.
I wrote the following AFL to use eSignal symbols if available, then use
Yahoo symbols if eSignal version is not available.
I load the $COMPQ which returns True if it exists and false if not. This
is
fine. Then based on that result I load ^IXIC if the $COMPQ load was false.
The problem: IIF() always executes both parts of the test so the 2nd
symbol
is always loaded regardless of whether the first symbol loaded or not.
(See
2nd section of code)
I can't use:
if(cond) load symbol A ELSE load symbol B
Because the if() statement is not for arrays.
I wonder if loading the 2nd choice first and then testing would work?
Would
this leave the first symbol loaded if the 2nd did not exist or would it
revert back to the selected symbol?
Suggestions?
----------------------
// Define symbol names
EnableTextOutput(False);
//First and second choices for the Nasdaq Composite Index
COMP = "$COMPQ";
COMP_alt = "^IXIC";
//Load available symbol for COMP
whichEquity = IIf(SetForeign(COMP,True,False),True,False);
whichEquity = IIf(whichEquity,False,SetForeign(COMP_alt,True,False));
AlertIf(whichEquity==0,"","Cannot find " + COMP + " or " + COMP_alt + "
symbols");
//Code using COMP goes here
RestorePriceArrays();
//First and second choices for the Nasdaq100 Index
NDX = "$NDX";
NDX_alt = "^NDX";
EnableTextOutput(True);
//Load available symbol for NDX -- same as above for COMP
whichEquity = IIf(SetForeign(NDX,True,False),True,False);
whichEquity = IIf(whichEquity,False,SetForeign(NDX_alt,True,False));
AlertIf(whichEquity==0,"","Cannot find " + NDX + " or " + NDX_alt + "
symbols");
//Next block of code uses NDX...
--
Terry
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