Question with the function getDay()

[Mermoz_2et]

Hello,
I try to code something and I need to know the number of the day into the week. As usual for the computer :
0 for sunday, 1 for monday, etc... 7 for saturday.
So, in the documentation I read that the function getDay() is the right to doing that.
But, when I use it, the answer is the number (of the day) into the month. For example today, I obtain : 20 because we are the 20 of february. Ok, but I know I have another function for that (as gateDate).
after that, my program is very simple.
just a question using this function as result of a variable
myvar = getDay(0).
and to obtain the currentbarindex when it is a week change
if (getDay(0) < getDay(-1)){...}

Please, if anybody would help me ?
thank you
Mermoz

[ACM]

Re: problem with the function getDay() and the official documentation

Mermoz
The function getDay() or day() return the day of the month of the bar being processed. For information on these functions see the links to the corresponding articles in the EFS KnowledgeBase
The getDay() you are referring to which returns the day of the week is instead a method of the Date Object (see the link to the article in the EFS KnowledgeBase)
Alex

Originally posted by Mermoz_2et
Hello,
I try to code something and I need to know the number of the day into the week. As usual for the computer :
0 for sunday, 1 for monday, etc... 7 for saturday.
So, in the documentation I read that the function getDay() is the right to doing that.
But, when I use it, the answer is the number (of the day) into the month. For example today, I obtain : 20 because we are the 20 of february. Ok, but I know I have another function for that (as gateDate).
after that, my program is very simple.
just a question using this function as result of a variable
myvar = getDay(0).
and to obtain the currentbarindex when it is a week change
if (getDay(0) < getDay(-1)){...}

Please, if anybody would help me ?
thank you
Mermoz

[ACM]

Mermoz
Here is one way you can identify a new week using the getDay() method.
Declare two global variables (ie outside of the main function) called [for example] prevDOW and currDOW and set them intiially to a value of 0. These variables will be used to store the prior day of the week and the current day of the week.
Then in the main function use the sample code enclosed below.

var barDate = getValue("time");//create a date object using the bar's date
if(getBarState()==BARSTATE_NEWBAR && day(0)!=day(-1)){//at every change of date
    prevDOW = currDOW;//assign to prevDOW the last known value of currDOW 
    currDOW = barDate.getDay();//assign to currDOW the current day of the week
    if(currDOW < prevDOW) {//if currDOW is less than prevDOW [ie it is a Sunday or Monday]
        //rest of your code
    }
} 

Alternatively you could just look for BARSTATE_NEWBAR on the weekly interval using the getBarStateInterval() function (see the link to the corresponding article in the EFS KnowledgeBase)

if(getBarStateInterval("w")==BARSTATE_NEWBAR){//at every first tick of a weekly bar
    //rest of your code
} 

Either way should allow you to determine a change in week
Alex

[Mermoz_2et]

Thank you, Alexis, for your answers, especially the last one.
I tried to code it with the key-word : getBarStateInterval, but nothing happens!
Perhaps I made a mistake in my code.
To make sure, I have a question:
When I search that word "getBarStateInterval" with the f(x) button in the efs window tool, I can't find it. Is it normal?
For your information, I loaded the last version of eSignal.
Do I have to do something to use this new key-word "getBarStateInterval" ? Is it possible to use it directly within the main function, or within a home-made function ?
Thanks in advance for your answer,
Mermoz.

[ACM]

Mermoz
I am not sure what you are referring to when you say "nothing happens" ie that no hints are appearing when you type the word in the Editor or if the function is not working
If the former then that seems to be because it has yet to be added to the formula keywords. This does not prevent you from being able to use it. For the description and syntax of the function see the link I provided in my previous reply.
If the latter then it could be an error in your code as it appears to be working at my end
In the following screenshot you can see that I am painting each first bar of the week using the code sample I provided and in the debug window you can see the bar indexes corresponding to those bars
You can use it in the main or any custom function



Keep in mind that there are also other ways to determine the beginning of a week including checking for a change of rawtime() based on the weekly interval (see the example in the screenshot enclosed below).
Alex

Originally posted by Mermoz_2et
Thank you, Alexis, for your answers, especially the last one.
I tried to code it with the key-word : getBarStateInterval, but nothing happens!
Perhaps I made a mistake in my code.
To make sure, I have a question:
When I search that word "getBarStateInterval" with the f(x) button in the efs window tool, I can't find it. Is it normal?
For your information, I loaded the last version of eSignal.
Do I have to do something to use this new key-word "getBarStateInterval" ? Is it possible to use it directly within the main function, or within a home-made function ?
Thanks in advance for your answer,
Mermoz.

[Mermoz_2et]

Hi Alexis,
thanks again. Perhaps after a reboot of my computer (after the download of the latest version ? I don't know), but it works! ... I mean your examples.
I try to use the getCurrentBarIndex obtained, to read and plot the previous close of this bar, as follows :

var etat = 0;
var Idx = 0;

function main(Color1, Color2, Color3, Epaisseur) {

    if(getBarStateInterval("w") == BARSTATE_NEWBAR){
        Idx = getCurrentBarIndex();
        etat = close(Idx);
    }

    if(etat == null){
        return;
    }

    return etat;
}{ 

and the result is on the attached image.
So You can see my problem, I obtain 2 lines (in black) and I can't recognize the close of these weeks. In fact I don't know what I obtain !

[ACM]

Mermoz
The function getCurrentBarIndex() returns the index of a bar relative to the most recent bar in the chart which has an index of 0. The bar index parameter used in the close() function is instead relative to the bar being processed.
So if you pass Idx [to which you have assigned the value of getCurrentBarIndex()] to the close() function you are in effect requesting the value of the Close at Idx bars prior to the bar being processed at that time [while the formula runs through historical bars] and not the value of the Close at a specific bar index.
If you want to retrieve the value of the last Close prior to a change of week you need to use close(-1). This is because BARSTATE_NEWBAR occurs on the first bar of the week hence the previous Close will be at bar index -1 relative to the bar being processed at that time while the formula runs through historical bars
Here is how you would need to modify your formula (the resulting plot is shown in the image enclosed below).

var etat = 0;

function main(Color1, Color2, Color3, Epaisseur) {

    if(getBarStateInterval("w") == BARSTATE_NEWBAR){
        etat = close(-1);
    }
    
    if(etat == null){
        return;
    }

    return etat;
} 

I am assuming that you are doing this to avoid using the weekly bar's Close which includes the Settlement else you could just use
close(-1,inv("w"))
which would return the prior week's Close based on the weekly bar
Alex

Originally posted by Mermoz_2et
Hi Alexis,
thanks again. Perhaps after a reboot of my computer (after the download of the latest version ? I don't know), but it works! ... I mean your examples.
I try to use the getCurrentBarIndex obtained, to read and plot the previous close of this bar, as follows :

var etat = 0;
var Idx = 0;

function main(Color1, Color2, Color3, Epaisseur) {

    if(getBarStateInterval("w") == BARSTATE_NEWBAR){
        Idx = getCurrentBarIndex();
        etat = close(Idx);
    }

    if(etat == null){
        return;
    }

    return etat;
}{ 

and the result is on the attached image.
So You can see my problem, I obtain 2 lines (in black) and I can't recognize the close of these weeks. In fact I don't know what I obtain !

[Mermoz_2et]

Hello Alexis,
thank you. It works well.
but another difficulty is coming up with the utilisation of the index return by :

if(getBarStateInterval("w") == BARSTATE_NEWBAR){
  Idx = getCurrentBarIndex();
 } 

the Interval may be "w" or "m" or "d", this is not the point.

I just need to know the last value of this Index beginning the code. I can obtain that value in a loop on the price serie, but I need this value in the beginning of my code. So, I tried to place this within a efsInternal function. and it doesn't work.
Is it possible to call a efsinternal function just to obtain this index?
I try and would be happy if you read and correct my code :

function main(){

result = myfunction()
...
return ..
}

myfunction()
   if(getBarStateInterval("w") == BARSTATE_NEWBAR){
      Idx = getCurrentBarIndex();
   }
   return Idx;
} 

I don't find how to make a loop on the serie price within an efsInternal function
Thanks in advance.
Mermoz

[Mermoz_2et]

Here is what I try to do, and perhaps several of us will be interested by that.

I use pivots points in daily, weekly and monthly intervals. But rapidly there is a forest of lines on my chart ! Not obvious on trading to focus my eyes on the useful line (which changes with the market, of course). So, in a first step I decided to represent just one period for each pivot point.
I precise :
the daily pivots just for the last day (the 5 lines : R2,R1,PP,S1,S2),
the weekly pivots just for the last week,
the monthy pivot just for the last month.

This is the reason I need to know, for each interval I use, the bar where the period changes. And perhaps it is a mistake, but it seems to me I need these changes before the loop on all the bar of my prices serie.
One another difficulty is I discovered if I use the key-word close() on a future contract in daily interval I obtain, not the close at 22h, (which I want use) but the settlement price ! and there is no function to distinguish the close and the settlement (perhaps a good innovation ?)
If anybody has suggestions ?
thank you.
Mermoz

[ACM]

Mermoz
Assuming I understood you correctly the simplest solution in my opinion would be to draw the lines using the drawLineRelative() function rather than plotting the values. This would allow you to easily display only the current lines for each interval (daily, weekly, etc)
The following image illustrates an example of how to do this using the code logic discussed up to this point and displays the results in the chart



The only addition I made to the logic is to decrease the values of the IdxW and IdxM variables by 1 as each new bar is added to the chart in real time
As I explained earlier in this thread using getBarStateInterval() is one way of defining a new period of an external interval and you can accomplish the same results using rawtime() based on the corresponding interval as shown in a previous example. The required logic does not change
If for whatever reason you instead want to plot the values then there are other solutions available that would allow you to display the plots only for the current period of an interval. You can find an example of how to do this for the daily interval in this thread and for the weekly interval in this thread. As to the monthly interval you can accomplish that by slightly modifying the logic used for the daily
At this point I believe you should have sufficient information and examples available to allow you to develop an efs that will suit your requirements
Alex

Originally posted by Mermoz_2et
Here is what I try to do, and perhaps several of us will be interested by that.

I use pivots points in daily, weekly and monthly intervals. But rapidly there is a forest of lines on my chart ! Not obvious on trading to focus my eyes on the useful line (which changes with the market, of course). So, in a first step I decided to represent just one period for each pivot point.
I precise :
the daily pivots just for the last day (the 5 lines : R2,R1,PP,S1,S2),
the weekly pivots just for the last week,
the monthy pivot just for the last month.

This is the reason I need to know, for each interval I use, the bar where the period changes. And perhaps it is a mistake, but it seems to me I need these changes before the loop on all the bar of my prices serie.
One another difficulty is I discovered if I use the key-word close() on a future contract in daily interval I obtain, not the close at 22h, (which I want use) but the settlement price ! and there is no function to distinguish the close and the settlement (perhaps a good innovation ?)
If anybody has suggestions ?
thank you.
Mermoz

[Mermoz_2et]

Thanks very much for your solution.
It works well !! and this code is very clean, very concise. I am working on it to include all the formulas of pivots points.
Just a little question if you have time; I try to understand the two lines

21   IdxW--;
22   IdxM--; 

If I understand, you decrement by 1 these two variables. So you begin the draw of each line one more bar on the past (difficult to say that in english to me). I tried without this "decrementation" and found no diffference. Is it normal ?
Thanks in advance
Mermoz

[ACM]

Mermoz
Those lines of code are executed on each new bar only if bRealTime is true which occurs only when real time data has been received [ie at BARSTATE_CURRENTBAR on bar index 0]
So until new bars get added in real time those lines of code have no effect
Alex

Originally posted by Mermoz_2et
Thanks very much for your solution.
It works well !! and this code is very clean, very concise. I am working on it to include all the formulas of pivots points.
Just a little question if you have time; I try to understand the two lines

21   IdxW--;
22   IdxM--; 

If I understand, you decrement by 1 these two variables. So you begin the draw of each line one more bar on the past (difficult to say that in english to me). I tried without this "decrementation" and found no diffference. Is it normal ?
Thanks in advance
Mermoz