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[amibroker] "if" and/or "SelectedValue" problem



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I'm 
hoping that someone can help me to understand what is happening with my AFL 
code.
<FONT face=Arial color=#0000ff 
size=2> 
AB 
won't let me do the following:
<FONT face=Arial color=#0000ff 
size=2> 
<FONT face=Arial color=#0000ff 
size=2>ShortOK = OI > 600;
if 
(ShortOK) {
<FONT face=Arial color=#0000ff 
size=2>    do something
<FONT face=Arial color=#0000ff 
size=2>}
<FONT face=Arial color=#0000ff 
size=2> 
It 
won't let me do that because ShortOK is an array, not an integer or 
boolean.
<FONT face=Arial color=#0000ff 
size=2> 
<FONT face=Arial color=#0000ff 
size=2> 
So, I 
tried this:
<FONT face=Arial color=#0000ff 
size=2> 
<FONT face=Arial color=#0000ff 
size=2>ShortOK = OI > 600;
if 
(SelectedValue(ShortOK)) {
<FONT face=Arial color=#0000ff 
size=2>    do something
<FONT face=Arial color=#0000ff 
size=2>}
<FONT face=Arial color=#0000ff 
size=2> 
AB 
will let me do it, but I don't seem to be getting the correct value.   

<FONT face=Arial color=#0000ff 
size=2> 
<FONT face=Arial color=#0000ff 
size=2> 
So, I 
made up some very simple code:
<FONT face=Arial color=#0000ff 
size=2> 
<FONT face=Arial color=#0000ff 
size=2>ShortOK = OI > 600;
Filter 
= 1;
<FONT face=Arial color=#0000ff 
size=2>AddColumn (ShortOK, "shortok");
<FONT face=Arial color=#0000ff 
size=2>AddColumn (SelectedValue(ShortOK), "selected");
<FONT face=Arial color=#0000ff 
size=2> 
When I 
run an exploration, I get different values for ShortOK and 
SelectedValue(ShortOK) and I expected them to be the same.
<FONT face=Arial color=#0000ff 
size=2> 
<FONT face=Arial color=#0000ff 
size=2> 
So, I 
must not understand what SelectedValue means and/or I don't understand how to 
get my "if" statement to work.
<FONT face=Arial color=#0000ff 
size=2> 
Any 
assistance would be appreciated, if you can wade your way through my 
notes.
<FONT face=Arial color=#0000ff 
size=2> 
<FONT face=Arial color=#0000ff 
size=2>Thanks






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