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 254 replies, 50 voices, and was last updated 1 month ago by robertogozzi.

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

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05/03/2020 at 3:06 PM #129595

robdav

Apologies for using the quote button.

Regardless of using my fictitious example, is there a way to use the ‘return’ statement to output the contents of an array? I guess not?

Thanks again.

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05/03/2020 at 3:17 PM #129598

Vonasi

No. RETURN requires each value to be listed separately so we have to use graphic instructions to output the values in the array if there are a lot of them.

Using DRAWTEXT can be a bit of a pain because we first have to convert our output to a non array type variable as DRWATEXT will not accept array variables.

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robdav

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05/03/2020 at 4:20 PM #129606

robdav

Thanks for your help Vonasi.

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05/06/2020 at 4:56 PM #130282

MPL

Hello everyone, hello Nicolas and Vonasi,

Do you know if it is possible to RESET AN ARRAY?
I’m very sorry if the question has already be asked (I haven’t find in topic but my english level being bad so I have maybe missed it…)

Thank you,

Mikaël

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05/06/2020 at 5:06 PM #130284

Nicolas

No you can’t reset an array but you can create as many as you want. But you can also loop through all the array column and give that column a value of 0 for instance, this index would be “set” (isset?) but with a 0 or any value you want to mark it as NULL.

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MPL

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05/11/2020 at 12:05 PM #131119

Philstrading

I’m a new bod to coding prorealtime, I find trawling through help files a litttle clumbersum but get a lot out of these posts with example coding that help me formulate code for my strategies. So just saying thanks that its all helpful to many levels of readers and I learn faster through trialling the code backtesting and tweaking. Got my first 3 codes running from this week, backtested of course. Very basic though but effective in backtesting, employed with good risk management of course.., but I’m finding my current knowledge restrictive when formulating code for entering on things like trend cycling, so all these titbits will hopefully get me there..

Cheers.

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05/13/2020 at 11:29 AM #131473

s00071609

Honestly, I have no clue about array. Just wondering of this feature will allow someone to code indicators based on chart clicks, save the data etc. See image below – example from MT4.

s00071609
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05/13/2020 at 11:39 AM #131483

robertogozzi

@s00071609

this topic ONLY deals with programming arrays. If you have no clue what they are, read this topic and other related ones or common programming rules for any known language.

Arrays only deal with an improved way of writing lines of code and make it easier to write more complicates software.

They have nothing to do with graphics, or interaction between charts and code.

What you are asking concerns the platform in general, the question has arisen multiple times, and the answer is NO. If you want to suggest new features you may use teh aforementioned forum.

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05/21/2020 at 8:18 PM #132692

Mel71

Hello Nicolas, I would like to get in touch with you, I am a novice with ideas in my head but I need an open mind which will be, I wish, your acquaintances. Thanks in advance, Regards.

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05/21/2020 at 9:23 PM #132709

robertogozzi

@Mel71

Only post in the language of the forumthat you are posting in. For example English only in the English speaking forums and French only in the French speaking forums.

Thank you 🙂

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05/22/2020 at 11:44 AM #132798

Nole djole

Bonjour, je m’appelle Nicolas j’ai 17 ans et j’aurais besoin de votre aide pour trouver un indicateur si vous pouvez mz donner votre email ou autre pour que je puisse vous expliquer exactment ce que je cherche ca serai genial. Merci encore pour vos poste et votre travail je vous suis il y a déjà 1 an et ca ma enormement appris j’espere que vous aller continue a posté et que vous pourrez m’aider pour mon indicateur. MERCI!

Hello, my name is Nicolas I am 17 years old and I would need your help to find an indicator if you can give me your email or something so that I can explain to you exactly what I am looking for it will be great. Thank you again for your post and your work, I followed you a year ago and that I learned a lot. I hope that you continue to post and that you can help me with my indicator. THANK YOU!

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05/22/2020 at 12:23 PM #132808

Vonasi

@Nole djole – I’m not sure what you have learned in the last year but it clearly is not what the few simple forum rules are.

Use only the language of the forum that you are posting in being one of the really simple ones.

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05/22/2020 at 2:55 PM #132837

robertogozzi

@Nole djole

Please stop asking the same question, you have appended your question 3 times in 3 differents topics. DO NOT append questions to existing topic, especially if your subject is different and even worse if you keep it undisclosed.

Nicolas already replied to you somewhere giving you any advice to reach him (you may also use the contact form).

We know you want to talk to Nicolas. Nicolas knows you want to talk to him. Please stop spamming the forum! Thank you 🙂

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05/22/2020 at 2:59 PM #132838

Nole djole

yes but how this forum work where did he respond to my question?

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05/22/2020 at 3:06 PM #132842

robertogozzi

Here https://www.prorealcode.com/topic/prorealcode-marketplace-vendez-vos-outils-de-trading-a-des-milliers-dutilisateurs-de-prorealtime/page/2/#post-132819

did you post that question or your account was hackered or you posted too many times and can’t find replies?

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array variables availability in ProRealTime – examples and discussions

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