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Chuck,
if statement has to decide which path has to be
taken.
It can make such decision only using SINGLE
value.
Arrays have many values (elements) therefore you have
to
choose one element to base "if" decision.
If you want to check ALL values of array you need a
loop:
for( i = 0; i < BarCount; i++ )
{
ShortOK = OI[ i ] > 600;
if( ShortOK )
{
// do something
}
}
If you want to check SINGLE value of array ,
you have to choose WHICH element you want to
check.
you can choose any bar from 0...(BarCount-1)
range.
For example, to check the very first bar:
ShortOK = OI[ 0 ] > 600;
if( ShortOK )
{
// do something
}
SelectedValue is a function that retrieves 'selected element'
of the array.
Since 'selection line' is available only for CHARTS.
SelectedValue gives
the value of array at bar that is currently selected in chart
by vertical line.
This is how it works in INDICATORS, INTERPRETATION and CHART
COMMENTARY
(because they are relative to selected bar)
In AA window 'selected element' means THE LAST BAR of
currently selected
analysis range. It is the last available bar for "all quotes"
and "last n quotes" range.
It is the the bar corresponding to "End Date" when using
"From-To" range.
So if you choose "all quotes" in AA
SelectedValue function is equivalent to
OpenInt[ BarCount - 1 ]
- it gives you SINGLE value equal to the OpenInterest for the
LAST bar
available
Therefore second column of your exploration would list the
same, one value
that represents last analysis bar.
Best regards,Tomasz Janeczkoamibroker.com
<BLOCKQUOTE
>
----- Original Message -----
<DIV
>From:
<A title=chuck_rademacher@xxxxxxxxxx
href="">Chuck Rademacher
To: <A title=amibroker@xxxxxxxxxxxxxxx
href="">amibroker@xxxxxxxxxxxxxxx
Sent: Sunday, May 11, 2003 10:26 AM
Subject: [amibroker] "if" and/or
"SelectedValue" problem
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;
<FONT face=Arial color=#0000ff
size=2>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>ThanksSend
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