problem with getBarState()

[dungn6au47]

My efs has been relying on getBarState() to return the BARSTATE_NEWBAR (numerical value = 0) when a new bar is arriving. I just found out that sometimes getBarState() returns 1 (BARSTATE_CURRENTBAR), not 0, when the first tick of a new bar is arriving. I attach a test efs. I ran a tick replay of AMZN data of 10/27/03 @ interval of 5000V with this efs. getBarState() failed to recognise new bar state for a couple of bars (e.g. bar 53, 95, 239, ...)

eSignal Technical Support Specialists please verify the problem. T

Dzung Nguyen

[Doji3333]

I use the following code to accomplish the same thing..

var nLastRawTime = 0;
var BarCount = 0;


function main() {

 if (nLastRawTime != getValue("rawtime", 0)) {
 //  new bar
     BarCount += 1;
     nLastRawTime = getValue("rawtime", 0);
 }

} 

Maybe this will help solve the problem.

[dungn6au47]

Hi Brad

Your coding would work with "time" intervals; with "volume" intervals my guess is it won't, right ? Anyway, thanks.

Dzung

Dzung,

Yes, it will work. I have been using this method myself for a while and have found it to be quite effective. The getValue("rawtime", 0) command updates "rawtime" when a new bar is formed and maintains the same value throughout bar formation. It is a time stamp, in effect, that does not change until the arrival of a new bar. It does not matter what parameter (e.g. - time, tick, volume, price change, ...) you are using as the basis for bar formation, as it only changes when a new bar comes.

[dungn6au47]

Hi Steve & Brad

I tried what you two suggested. It seems to work at first (chart 3), then not working (chart 4). Any ideas what's causing this problem ?

Dzung

[dungn6au47]

chart4

[dungn6au47]

And the efs:

var nLastRawTime = 0;
var BarIndex = 0;
var C, C1;

function preMain() {
// setStudyTitle("Test_BarIndex[rawtime]");
setPriceStudy(true);
/* setCursorLabelName("C",0);
setDefaultBarFgColor(Color.black,0);
setDefaultBarThickness(2,0);
*/

}
function main() {
C1 = C;
C = close();
if (nLastRawTime != getValue("rawtime", 0)) {
BarIndex += 1;
DrawCntr = "X" + BarIndex;
drawLineRelative(-1, C1, -1, C1, PS_DOT, 8, Color.red, DrawCntr);
nLastRawTime = getValue("rawtime", 0);
}
return;
}

[eSignal_JasonK]

Hello Dzung,

This drift you are seeing is a known problem. Our development is working on a solution. Not sure if it will be fixed for 7.5.

[dungn6au47]

Hi Jason

Did you mean that currently it is a problem even with version 7.5 Beta and the development team is still working on a solution ? And therefore not sure whether it will be fixed prior to the release of version 7.5 in mid November ?

Dzung

Dzung,

The problem you are now seeing in playback mode oddly is because you are using

if (nLastRawTime != getValue("rawtime", 0)) {

in playback mode. I believe you are getting some bars that are coming in simultaniously and as such, this test does not pick them up as individual bars. here is my code which has a test for playback mode which excludes

if (nLastRawTime != getValue("rawtime", 0)) {

in playback mode

function main() {
  var BarState = getBarState();
  nIndex = getCurrentBarIndex();    //debugPrintln("nIndex = " +nIndex); 

        
    
    //----------------------------------------------------------------------------------------     
    if (nIndex < -120){return;} // minimizes load time
    var i;var j;  var k;  var d = 0;
  if (isPlayBackMode()==1){nLastRawTime = getValue("rawtime",0);}//for playback mode
    if (getValue("rawtime",0) != nLastRawTime || BarState == BARSTATE_NEWBAR) {     
        nLastRawTime = getValue("rawtime",0);
        tTime = nTime();//tTime [0] = milliseconds, [1] = h:m:s, [2] = MM-DD-YYYY, [3] = h, [4] = m, [5] = s, [6] = Total s.
        //var nArray  = getValueAbsolute( "Close", 0, -25 );
        for (i=0;i<25;i++){nArray[i]= close(-i);}
        barcount +=1;//debugPrintln("barcount = " +barcount); 

see if that works for you.

Dzung,

To continue, In RT, I use the following conditional which checks for both rawtime change and BarState

if (getValue("rawtime",0) != nLastRawTime || BarState == BARSTATE_NEWBAR) { 

This has been very reliable for me.

In Playback, I had all kinds of problems with just using

getValue("rawtime",0) 

so I added the BarState into the conditional and put a step in front of the conditional which takes rawtime out of the picture while in Playback mode. Clear as mud eh?