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Gordon,
If you want "to determine the bar number for a bar that corresponds
to a previous date"
then a Valuewhen() statement would do the job.
// -- We want bar index for 10/19/1999
nYear = 1999; nMonth = 10; nday = 19;
nExploreDate = (10000 * (nYear - 1900)) + (100 * nMonth) + nDay;
barNo=ValueWhen(DateNum()==nExploreDate,BarIndex());
Dimitris Tsokakis
--- In amibroker@xxxxxxxxxxxxxxx, "Gordon" <gordon@xxxx> wrote:
> Hi All,
>
> I've got some code to determine the bar number for a bar that
> corresponds to a previous date. What's strange is that I always get
> an array index error, eventhough the debug window shows the code
> executing successfully twice before it fails on a third execution --
> all three executions coming from a single click of the Apply button
> in the editor window. The code is below, followed by the debug
output
> for the trace statements. If I create a new indicator, paste the
code
> in and click apply, I'll see the candle chart flash, and then I'll
> get an array index error. If I look at the debug output, everything
> looks fine through those first two executions of the code (why
two?)
> and then suddenly -- with no user intervention whatsoever -- an
array
> of datenums becomes empty on a third run through the script.
>
> Can anyone identify the issue? This is driving me nuts. I'm hoping
I
> won't have to rewrite everything in vbscript of vb or something to
> avoid this craziness.
>
> _TRACE(" ");
> _TRACE("Starting...");
> _TRACE(" ");
>
> DN = DateNum();
> nLastDateNum = LastValue(DN);
> nLastBarNum = LastValue(BarIndex());
>
> bContinue = False;
> bLoop = True;
> bDebug = True;
>
> noBarsBack = 80;
> startBar = 0;
> nCurBar = 0;
>
> // -- We want bar index for 10/19/1999
> nYear = 1999; nMonth = 10; nday = 19;
> nExploreDate = (10000 * (nYear - 1900)) + (100 * nMonth) + nDay;
>
> if (nExploreDate > 0) {
> bLoop = True;
> bContinue = False;
> // -- There have to be enough bars
> if (nLastDateNum >= nExploreDate
> && nLastBarNum >= (noBarsBack+1)) {
> // -- keep moving 1/2 the direction
> // just moved toward desired bar
> idx = int(nLastBarNum /2);
> previdx = nLastBarNum;
> swapidx = 0;
> while (bLoop) {
> // -- Let's see in dbg view what I have
> _TRACE("idx: " + idx);
> _TRACE("DN[idx]: " + WriteVal(DN[idx], 7.0));
> testDN = DN[idx];
> if (testDN == nExploreDate) {
> bLoop = False;
> if (idx >= (noBarsBack+1)) {
> startBar = idx;
> bContinue= True;
> }
> } else if (testDN < nExploreDate) {
> // -- move 1/2 the distance of last move forward
> swapidx = idx;
> idx = idx + int( abs((previdx - idx))/ 2);
> previdx = swapidx;
> if (idx==previdx) bLoop = False;
> } else {
> swapidx = idx;
> idx = idx - int(abs((previdx - idx))/ 2);
> previdx = swapidx;
> if (idx==previdx) bLoop = False;
> }
> }
> }
> // -- if (nExploreDate > 0)
> } else {
> startBar = nLastBarNum;
> noBarsRequired = noBarsBack+1;
> bProcess = True;
> }
>
> GraphXSpace=7;
>
> // -- Plot basic candle chart
> PlotOHLC(Open, High, Low, Close,
> "BIdx = " + BarIndex() +
> "\n" + "O = " + O + "\n"+"H = "+ H + "\n"+"L = " + L
> + "\n"+"C ",
> colorBlack, styleCandle);
>
> // *************************************
>
> Debug output:
>
> [22140]
> [22140] Starting...
> [22140]
> [22140] idx: 721
> [22140] DN[idx]: 1,010,814
> [22140] idx: 360
> [22140] DN[idx]: 1,000,309
> [22140] idx: 180
> [22140] DN[idx]: 990,623
> [22140] idx: 270
> [22140] DN[idx]: 991,029
> [22140] idx: 225
> [22140] DN[idx]: 990,826
> [22140] idx: 247
> [22140] DN[idx]: 990,928
> [22140] idx: 258
> [22140] DN[idx]: 991,013
> [22140] idx: 263
> [22140] DN[idx]: 991,020
> [22140] idx: 261
> [22140] DN[idx]: 991,018
> [22140] idx: 262
> [22140] DN[idx]: 991,019
> [22140]
> [22140] Starting...
> [22140]
> [22140] idx: 721
> [22140] DN[idx]: 1,010,814
> [22140] idx: 360
> [22140] DN[idx]: 1,000,309
> [22140] idx: 180
> [22140] DN[idx]: 990,623
> [22140] idx: 270
> [22140] DN[idx]: 991,029
> [22140] idx: 225
> [22140] DN[idx]: 990,826
> [22140] idx: 247
> [22140] DN[idx]: 990,928
> [22140] idx: 258
> [22140] DN[idx]: 991,013
> [22140] idx: 263
> [22140] DN[idx]: 991,020
> [22140] idx: 261
> [22140] DN[idx]: 991,018
> [22140] idx: 262
> [22140] DN[idx]: 991,019
> [22140]
> [22140] Starting...
> [22140]
> [22140] idx: 721
> [22140] DN[idx]: {EMPTY}
>
>
> On the third run -- and I have no idea why the code executes three
> times for one button click -- DN[idx]: {EMPTY} is suddenly empty.
> This makes absolutely no sense to me. Thanks for your help on this.
>
> Gordon
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