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Dynamic Multidimensional Arrays

  • Post #1
  • Quote
  • First Post: Apr 24, 2010 10:24am Apr 24, 2010 10:24am
Okay so I'm trying to create a dynamic multidimensional array... but it doesn't seem like it's possible in metatrader?

We can do something like this

Inserted Code
int test[];

but this won't work...

Inserted Code
int test[][][];

Sorry if I'm not explaining this well
why it won't work? quoted from MQL4 Language Reference:
"Arrays are allowed to be maximum four-dimensional."
Quoting sangmane
why it won't work? quoted from MQL4 Language Reference:
"Arrays are allowed to be maximum four-dimensional."
Yes I know that, but can all four be dynamic at the same time?

like this would work but it's limited...
Inserted Code
int test[][5][5];

otherwise can you resize other dimensions?
No ... Only the first dimension can be dynamic so you can have

int one[];
int two[][6];
int three[][10][20];

etc.

Not sure if MT5 enhances this or not.
I wonder...

Would it be possible to have an array inside an array element?
Quoting MoForce
Yes I know that, but can all four be dynamic at the same time?

like this would work but it's limited...
Inserted Code
int test[][5][5];
hey mo..... out of couriosty, why is that limited..... obviously you are imposing a limit of 5, but you could just as easily have [][500][500]..... if it's not something you'd prefer to keep private, what is it your wanting to do..... why do all need to be dynamic....h

//-----

//----- fwiw

and i know i've been chastised by others for suggesting this, i understand their point completely, but still tend to set arrays with high values....
double array[20][700][700].....

my biggest hurdle was to developing a method of filling the arrays which could easily be recalled.... once that was accomplished, a single multidimensional array can now hold every conceivable indicator value along with every conceivable signal derived from those indicators, both past and present, on every single timeframe on every single pair.....

all in a single multidimensional array ...... which is why the 'limited' part of your post has me confused.....h
to trade and code, keep both simple... no call to impress....h
Quoting hayseed
hey mo..... out of couriosty, why is that limited..... obviously you are imposing a limit of 5, but you could just as easily have [][500][500]..... if it's not something you'd prefer to keep private, what is it your wanting to do..... why do all need to be dynamic....
I've got an idea for a dynamic neural network which could help settle the question of whether the market is predictable or not. I've worked it out on paper and it looks good... putting it into code however... lol it's pretty hard with MQL. I might just end up creating something that just feeds the data from MT elsewhere to be processed.

I could have [][500][500] but that's limited for what I'm trying to accomplish. I can't say why since it might give away what my idea is.

Quoting Ronald Raygun
I wonder...

Would it be possible to have an array inside an array element?
Yeah I was messing around with that idea too... I don't think it's possible

Quoting rangebound
No ... Only the first dimension can be dynamic so you can have

int one[];
int two[][6];
int three[][10][20];

etc.

Not sure if MT5 enhances this or not.
Yeah I tried MT5 too and it doesn't offer too much help.

Anyway I think I've got something going I'll have to train it for a while though
Here's a graphical representation of the growing network... it's based on the past 2 Months of 1Min data from G/U

If this is not successful I'll be back in a month or two with another crazy idea so until then...
Attached Image
and just for kicks... I did a 3D version of a portion of the network (just a portion so it renders quickly)
Attached Image (click to enlarge)
Click to Enlarge Name: 3DNetwork.PNG Size: 33 KB
Uhhh I'm back to ask 1 question lol

when running the strategy tester in MT5... where are files stored (like ones created with FileOpen(name,FILE_READ|FILE_WRITE); )?

thanks
hey mo..... if your refering to files you are creating/writing, they can be found in the files folder in the experts folder......h
to trade and code, keep both simple... no call to impress....h
I think in MT5 it's stored in tester/files
Quoting Ronald Raygun
I think in MT5 it's stored in tester/files
That's what I thought... but I don't see anything... in fact I don't think my EA is getting tested at all O.o Does this have something to do with http://www.forexfactory.com/showpost...60&postcount=4

do I need to download another copy of MT5?
Make sure you download the latest version.

Then make sure you load data into the strategy tester.

Then make sure that it actually can be backtested.

Use one of the sample EAs to try and run backtests.
Quoting Ronald Raygun
Make sure you download the latest version.

Then make sure you load data into the strategy tester.

Then make sure that it actually can be backtested.

Use one of the sample EAs to try and run backtests.
Hmm ... I thought it updates automatically... upon checking it looks like I do have an older version

Will do

Thanks RR
hey mo..... sorry, my error....... somehow i was thinking you were using mq4..... if so, all my comments above might be incorrect..... this of course includes my post on arrays......

//----

so it's a neural network using multi-demensional arrays in mq5 ........ ..... you are definitely living up to the username moforce....... kinda wish i was that ambitious..... h
to trade and code, keep both simple... no call to impress....h
Quoting hayseed
hey mo..... sorry, my error....... somehow i was thinking you were using mq4..... if so, all my comments above might be incorrect..... this of course includes my post on arrays......

//----

so it's a neural network using multi-demensional arrays in mq5 ........ ..... you are definitely living up to the username moforce....... kinda wish i was that ambitious..... h
lol it's cool... I was actually pretty much referring to both and it looks like MQL5 better supports what I'm up to so that's why I mentioned it. Only thing is it takes the EA I made FOREVER to process the history data in order for it to actually run lol.

And a lot of the projects I start up end up being useless in the end so don't feel bad I wish I didn't waste so much time on these things lol

btw so I'm wondering... if I have a loop like this

PHP Code
 int OnInit()
{
for(i=Bars(NULL,0)-1;i<=1;i--)
{...code...}
} 
which takes an hour to get through, does the EA ever get caught up to speed? (as in, does whatever new bars within that hour of calculation get factored in too? Or do they get skipped - in which case I'd have to add a timestamp to get the gaps filled x.x)

If the new bars that occur within the hour of processing time... I might be better off using it on a higher TF
  • Post #18
  • Quote
  • Last Post: Sep 21, 2010 7:02pm Sep 21, 2010 7:02pm
Quoting MoForce
and just for kicks... I did a 3D version of a portion of the network (just a portion so it renders quickly)
I saw an image of Brownian motion... http://upload.wikimedia.org/wikipedi...process_3d.png

it reminded me of this
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