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 246 replies, 50 voices, and was last updated 1 month ago by Nicolas.

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

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07/15/2024 at 5:48 PM #235300

druby

A strategy application, well that will take some time, I’ll have to sleep on that one.

Regarding volume, if you replace the ‘close’ on line 10, with volume,

that appears to display the volume values of the 1 tick chart I believe.

Dam, I told everyone, doh

druby
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07/17/2024 at 11:31 AM #235368

PeterSt

Not sure how this will work out :

@Nicolas, page 15 of this topic presents a black screen. This is how the topic “don’t know what happened, but this was the ‘Array Post'” emerged (a continuation of the original topic).
I am now responding to page 14 – maybe that recovers page 15. But if not, I will post it in that 2nd topic (see below). And in that case ? can the Array Topic be repaired ?

PeterSt
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07/17/2024 at 11:34 AM #235370

PeterSt

Not sure how this will work out :

@Nicolas, page 15 of this topic (see 2nd pic) presents a black screen. This is how the topic “don’t know what happened, but this was the ‘Array Post'” emerged (a continuation of the original topic).
I am now responding to page 14 – maybe that recovers page 15. But if not, I will post it in that 2nd topic (see below). And in that case ? can the Array Topic be repaired ?

… so it did not work out. See the 2nd pic below for the topic which is stuck.

PeterSt
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07/17/2024 at 11:36 AM #235374

Nicolas

Ok, I will look at what happened in the original topic, thanks for let me know!

Nicolas
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07/17/2024 at 11:58 AM #235379

Nicolas

It should work by now.

Nicolas
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07/17/2024 at 12:32 PM #235382

PeterSt

Yes, super. Thank you @Nicolas.
You could consider to merge this topic here (the “Don’t know what happened”) with the original ?

PeterSt
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07/18/2024 at 7:25 AM #235457

Nicolas

The topics are merged, have a nice day! 🙂

Nicolas
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