array variables availability in ProRealTime – examples and discussions

Nicolas · Thu, 06 Feb 2020 09:17:13 +0000

The variable arrays will arrive soon in ProRealTime, they will be available in the coming weeks in version 11, with other instructions which I will detail in this topic. I consider this to be a major addition to the ProBuilder language and a radical change in the way we program and for this reason, I think that a topic in the forum is much more suitable for offering examples and discuss. Do not hesitate to ask your questions if things do not seem clear to you at first, I will try to answer as best I can. I will add concrete examples to this topic for future reference. As soon as these new features are deployed in public, you can also come here to offer your examples and your questions in the event of necessary debugging concerning variable arrays. There are so many new possibilities now, that I have been testing for 2 weeks and apart from a few small concerns that have been brought up and corrected since, I must say that I was impressed by the quality and precision of the new instructions offered, thank you IT-Finance and ProRealTime, the year 2020 will be an amazing year for coders! 🙂 In the introduction, I would like to recall what array variable is and why it is so important to be able to use it in programming. An array is a special variable, which can hold more than one value at a time. If you have a list of values (a list of recent highest high, for example), storing them in single variables could look like this: period = 5 if high[period] >= highest[(period)*2+1](high) then //new highest high if hh1=0 then hh1 = high[period] elsif hh2=0 then hh2 = high[period] elsif hh3=0 then hh3 = high[period] endif endif return hh1,hh2,hh3 However, what if you want to loop through the highest high and find a specific one? And what if you had not 3 highest high to store, but 300? The solution is to create an array! An array can hold many values under a single name, and you can access the values by referring to an index number. In ProBuilder, variables array are declared with $ sign before their names, so following our previous example, our 3 variables could now be stored like this: period = 5 if high[period] >= highest[(5)*2+1](high) then //new highest high if not isset($hh[0]) then $hh[0] = high[period] elsif not isset($hh[1]) then $hh[1] = high[period] elsif not isset($hh[2]) then $hh[2] = high[period] endif endif return $hh[0],$hh[1],$hh[2] Note that an array always begin at 0. This is how you should represent how the values are stored in an array: Each index represent a column of the table where you put a value that you will be able to access anytime and anywhere in your code. An index which hasn’t received any value yet is equal to 0. More dynamically, we could store values in an array like this: period = 5 if high[period] >= highest[(period)*2+1](high) then //new highest high $hh[myindex] = high[period] //store highest high myindex=myindex+1 //increase the index of the array for next highest high store endif In this example, each time a new highest high is detected, we store its new value into a new column of the array. By using the instruction lastset(), we retrieve the last known column of the array, so by adding 1 to this number, we add dynamically a new column in order to store a new value. Don’t worry about the size of the array, it can handle 1 million index! Easy! Ready for our first example? See below.

This topic has 205 replies, 45 voices, and was last updated 2 months ago by Nicolas.

Tagged: array, arraymax, arraymin, drawpoint, isset, lastset

Viewing 11 posts - 196 through 206 (of 206 total)

← 1 2 3 4 5 6 7 8 9 10 11 12 13 14

12/26/2022 at 10:48 AM #206317

thomas2004ch

Hi Nicolas,

I use your example1 to the TSLA chart. But it seems a very important resistance/support zone could not be found?

thomas2004ch
Participant

Topics: 26
Replies: 37
Been thanked: 1 time

12/26/2022 at 10:50 AM #206319

Nicolas

That code are using tops and bottoms aligned, not accumulation of prices in the same zone.

Nicolas
Keymaster

Topics: 81
Replies: 20734
Been thanked: 4665 times

12/26/2022 at 1:53 PM #206323

thomas2004ch

Hi Nicolas,

I use the example4 on the SPY. But it looks quite different than your example screen.

thomas2004ch
Participant

Topics: 26
Replies: 37
Been thanked: 1 time

12/26/2022 at 1:55 PM #206325

Nicolas

Because you are applying it on the daily chart. Pivot points change everyday and that’s what you observed as a curve on a daily chart.

Nicolas
Keymaster

Topics: 81
Replies: 20734
Been thanked: 4665 times

12/26/2022 at 2:02 PM #206326

thomas2004ch

I apply your example5 on SPY but see nothing.

thomas2004ch
Participant

Topics: 26
Replies: 37
Been thanked: 1 time

12/26/2022 at 2:11 PM #206328

Nicolas

Do not add it on the price, but like an oscillator indicator.

Nicolas
Keymaster

Topics: 81
Replies: 20734
Been thanked: 4665 times

04/26/2023 at 2:44 PM #213774

Aragorna

Hi Nicolas, I know it’s an old topic but I’m struggling to understand the use of Array. If I put in this indicator Timeframe (1 day, Updateonclose) at the beginning of the code Example #1: support and resistance example, based on fractals points, is it possible to see the rectangles of that timeframe on my chart timeframe 5 minutes? I ask you this because if I do that, I don’t see anything, probably I’m missing something. Second question, If I want to see the condition if price close in TF 5 minutes for example in the middle of a $Topy(y) – $Topy(y) detected in TF 1 day, do I have to do a cycle For, to look for the array and then code a Buy if that condition is Ok? It’s not clear for me, it’d be of great help if you could help me.

thank’s in advance

Alessio

Aragorna
Participant

Topics: 23
Replies: 77
Been thanked: 7 times

09/05/2023 at 7:37 AM #220348

Pieter_T

If you have a list of values (a list of recent highest high, for example), storing them in single variables could look like this:

Hi Nicolas,

In your post on 2/6/2020 you seem to have examples or code you used for explanation of the ArrayMax. For some reason, I cannot copy this code or view it. Are these still available?

Thx

Pieter

Pieter_T
Participant

Topics: 5
Replies: 27
Been thanked: 5 times

09/05/2023 at 8:11 AM #220349

Khaled

I had the same issue when I first copied the code. If I remember well, you need to reduce/increase the factor of 0.5, it’s ticker and timeframe dependent.

Khaled
Participant

Topics: 59
Replies: 314
Been thanked: 65 times

09/05/2023 at 8:16 AM #220350

Nicolas

Aragorna wrote:

If I put in this indicator Timeframe (1 day, Updateonclose) at the beginning of the code Example #1: support and resistance example, based on fractals points, is it possible to see the rectangles of that timeframe on my chart timeframe 5 minutes?

No, if you want to get the support and resistance detection of the daily timeframe in an inferior timeframe, then the detection must be made in the code. The example #1 should be changed a bit for that purpose..

Aragorna wrote:

If I want to see the condition if price close in TF 5 minutes for example in the middle of a $Topy(y) – $Topy(y) detected in TF 1 day, do I have to do a cycle For, to look for the array and then code a Buy if that condition is Ok?

Yes, if you want to find something relevant for your condition in the table, then loop in it and explore the data stored 🙂

Nicolas
Keymaster

Topics: 81
Replies: 20734
Been thanked: 4665 times

09/05/2023 at 8:18 AM #220351

Nicolas

Pieter_T wrote:

In your post on 2/6/2020 you seem to have examples or code you used for explanation of the ArrayMax. For some reason, I cannot copy this code or view it.

I recoded the examples in the first post.

1 user thanked author for this post.

Pieter_T

Nicolas
Keymaster

Topics: 81
Replies: 20734
Been thanked: 4665 times
Author

Posts

Viewing 11 posts - 196 through 206 (of 206 total)

← 1 2 3 4 5 6 7 8 9 10 11 12 13 14

Find exclusive trading pro-tools on

array variables availability in ProRealTime – examples and discussions

1 user thanked author for this post.