How do you add an item to an Array in MQL4?
I'm trying to create an Array in MQL4, and on every tick I want to add a new value to array[0] and push the rest of the items back, so the old array[0] becomes array[1] and array[1] becomes array[2] and so on. I want to be able to do this an unlimited number of times, once per tick. Then I can access the value from the previous tick using array[1], but I can also access its current value array[0]. Thanks!
arrays mql4
asked Nov 12 at 18:55
Wayne Filkins
937
add a comment |
I'm trying to create an Array in MQL4, and on every tick I want to add a new value to array[0] and push the rest of the items back, so the old array[0] becomes array[1] and array[1] becomes array[2] and so on. I want to be able to do this an unlimited number of times, once per tick. Then I can access the value from the previous tick using array[1], but I can also access its current value array[0]. Thanks!
arrays mql4
asked Nov 12 at 18:55
Wayne Filkins
937
add a comment |
I'm trying to create an Array in MQL4, and on every tick I want to add a new value to array[0] and push the rest of the items back, so the old array[0] becomes array[1] and array[1] becomes array[2] and so on. I want to be able to do this an unlimited number of times, once per tick. Then I can access the value from the previous tick using array[1], but I can also access its current value array[0]. Thanks!
arrays mql4
asked Nov 12 at 18:55
Wayne Filkins
937
I'm trying to create an Array in MQL4, and on every tick I want to add a new value to array[0] and push the rest of the items back, so the old array[0] becomes array[1] and array[1] becomes array[2] and so on. I want to be able to do this an unlimited number of times, once per tick. Then I can access the value from the previous tick using array[1], but I can also access its current value array[0]. Thanks!
arrays mql4
arrays mql4
asked Nov 12 at 18:55
Wayne Filkins
937
asked Nov 12 at 18:55
Wayne Filkins
937
asked Nov 12 at 18:55
Wayne Filkins
937
asked Nov 12 at 18:55
Wayne Filkins
937
asked Nov 12 at 18:55
Wayne Filkins
937
937
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
It is possible to have an array of primitives in MQL4, the problem here is that you will have to copy them all each tick which is waste of time and resources. If you want to save some more advanced data (let's say MqlTick), you have to store it as the structure or create a class and save classes. It should be really senseless to copy all objects, that is why you should think of applying CList or CArrayObj and adding objects to the end. Simple magic would help to call element with index 0:
#include <ArraysArrayObj.mqh>
class CTick : public CObject{
public: double m_bid, m_ask;
CTick(const double bid,const double ask):m_bid(bid),m_ask(ask){}
};
CArrayObj *listOfTicks;
CTick *getTickByShift(const int shift=0)
{
return listOfTicks.At(listOfTicks.Total()-1-shift));
}
int OnInit(){
listOfTicks=new CArrayObj();
return(1);
}
void OnTick(){
listOfTicks.Add(new CTick(Bid,Ask));
//example of accessing ticks 0 and 3, keep in mind you do not have 3 at start!
double bid0=getTickByShift(0).m_bid;
double ask3=getTickByShift(3).m_bid;
}
void OnDeinit(const int reason){delete listOfTicks;}
If you need really unlimited number of operations - probably 2^31-1 would be enough for you, to speed up you may think of listOfTicks.Step(1000); to have 1000 empty slots and do not resize(=copy all to the new location) the array every tick.
answered Nov 12 at 20:16
Daniel Kniaz
2,2502715
I don't really need "infinite", just one for every bar, so for long back-tests it will require a lot. It's actually running on every bar, not on every tick, but I already have the code for that so I didn't include it in the info. Your answer looks very promising and I shall try it :)
– Wayne Filkins
Nov 12 at 20:54
2^31 should do the trick
– Wayne Filkins
Nov 12 at 20:55
What i'm really trying to do is add the equivalent of how high and low work. For high you can go high[5] or high[400] to grab previous candle highs, and i'm trying to basically make my own variables that do that. I have one that changes constantly based on different conditions, and I need to be able to go var[5] or var[50] at any given time. So like a series in tradingview (converting my tradingview script to mql4)
– Wayne Filkins
Nov 12 at 20:58
This is what I got with that code: i.imgur.com/RTrihke.png
– Wayne Filkins
Nov 12 at 21:21
addvoid OnDeInit(const int reason){delete(listOfTicks);}in order to kill remaining objects at end
– Daniel Kniaz
Nov 12 at 22:07
|
show 3 more comments
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1 Answer
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It is possible to have an array of primitives in MQL4, the problem here is that you will have to copy them all each tick which is waste of time and resources. If you want to save some more advanced data (let's say MqlTick), you have to store it as the structure or create a class and save classes. It should be really senseless to copy all objects, that is why you should think of applying CList or CArrayObj and adding objects to the end. Simple magic would help to call element with index 0:
#include <ArraysArrayObj.mqh>
class CTick : public CObject{
public: double m_bid, m_ask;
CTick(const double bid,const double ask):m_bid(bid),m_ask(ask){}
};
CArrayObj *listOfTicks;
CTick *getTickByShift(const int shift=0)
{
return listOfTicks.At(listOfTicks.Total()-1-shift));
}
int OnInit(){
listOfTicks=new CArrayObj();
return(1);
}
void OnTick(){
listOfTicks.Add(new CTick(Bid,Ask));
//example of accessing ticks 0 and 3, keep in mind you do not have 3 at start!
double bid0=getTickByShift(0).m_bid;
double ask3=getTickByShift(3).m_bid;
}
void OnDeinit(const int reason){delete listOfTicks;}
If you need really unlimited number of operations - probably 2^31-1 would be enough for you, to speed up you may think of listOfTicks.Step(1000); to have 1000 empty slots and do not resize(=copy all to the new location) the array every tick.
answered Nov 12 at 20:16
Daniel Kniaz
2,2502715
I don't really need "infinite", just one for every bar, so for long back-tests it will require a lot. It's actually running on every bar, not on every tick, but I already have the code for that so I didn't include it in the info. Your answer looks very promising and I shall try it :)
– Wayne Filkins
Nov 12 at 20:54
2^31 should do the trick
– Wayne Filkins
Nov 12 at 20:55
What i'm really trying to do is add the equivalent of how high and low work. For high you can go high[5] or high[400] to grab previous candle highs, and i'm trying to basically make my own variables that do that. I have one that changes constantly based on different conditions, and I need to be able to go var[5] or var[50] at any given time. So like a series in tradingview (converting my tradingview script to mql4)
– Wayne Filkins
Nov 12 at 20:58
This is what I got with that code: i.imgur.com/RTrihke.png
– Wayne Filkins
Nov 12 at 21:21
addvoid OnDeInit(const int reason){delete(listOfTicks);}in order to kill remaining objects at end
– Daniel Kniaz
Nov 12 at 22:07
|
show 3 more comments
It is possible to have an array of primitives in MQL4, the problem here is that you will have to copy them all each tick which is waste of time and resources. If you want to save some more advanced data (let's say MqlTick), you have to store it as the structure or create a class and save classes. It should be really senseless to copy all objects, that is why you should think of applying CList or CArrayObj and adding objects to the end. Simple magic would help to call element with index 0:
#include <ArraysArrayObj.mqh>
class CTick : public CObject{
public: double m_bid, m_ask;
CTick(const double bid,const double ask):m_bid(bid),m_ask(ask){}
};
CArrayObj *listOfTicks;
CTick *getTickByShift(const int shift=0)
{
return listOfTicks.At(listOfTicks.Total()-1-shift));
}
int OnInit(){
listOfTicks=new CArrayObj();
return(1);
}
void OnTick(){
listOfTicks.Add(new CTick(Bid,Ask));
//example of accessing ticks 0 and 3, keep in mind you do not have 3 at start!
double bid0=getTickByShift(0).m_bid;
double ask3=getTickByShift(3).m_bid;
}
void OnDeinit(const int reason){delete listOfTicks;}
If you need really unlimited number of operations - probably 2^31-1 would be enough for you, to speed up you may think of listOfTicks.Step(1000); to have 1000 empty slots and do not resize(=copy all to the new location) the array every tick.
answered Nov 12 at 20:16
Daniel Kniaz
2,2502715
I don't really need "infinite", just one for every bar, so for long back-tests it will require a lot. It's actually running on every bar, not on every tick, but I already have the code for that so I didn't include it in the info. Your answer looks very promising and I shall try it :)
– Wayne Filkins
Nov 12 at 20:54
2^31 should do the trick
– Wayne Filkins
Nov 12 at 20:55
What i'm really trying to do is add the equivalent of how high and low work. For high you can go high[5] or high[400] to grab previous candle highs, and i'm trying to basically make my own variables that do that. I have one that changes constantly based on different conditions, and I need to be able to go var[5] or var[50] at any given time. So like a series in tradingview (converting my tradingview script to mql4)
– Wayne Filkins
Nov 12 at 20:58
This is what I got with that code: i.imgur.com/RTrihke.png
– Wayne Filkins
Nov 12 at 21:21
addvoid OnDeInit(const int reason){delete(listOfTicks);}in order to kill remaining objects at end
– Daniel Kniaz
Nov 12 at 22:07
|
show 3 more comments
It is possible to have an array of primitives in MQL4, the problem here is that you will have to copy them all each tick which is waste of time and resources. If you want to save some more advanced data (let's say MqlTick), you have to store it as the structure or create a class and save classes. It should be really senseless to copy all objects, that is why you should think of applying CList or CArrayObj and adding objects to the end. Simple magic would help to call element with index 0:
#include <ArraysArrayObj.mqh>
class CTick : public CObject{
public: double m_bid, m_ask;
CTick(const double bid,const double ask):m_bid(bid),m_ask(ask){}
};
CArrayObj *listOfTicks;
CTick *getTickByShift(const int shift=0)
{
return listOfTicks.At(listOfTicks.Total()-1-shift));
}
int OnInit(){
listOfTicks=new CArrayObj();
return(1);
}
void OnTick(){
listOfTicks.Add(new CTick(Bid,Ask));
//example of accessing ticks 0 and 3, keep in mind you do not have 3 at start!
double bid0=getTickByShift(0).m_bid;
double ask3=getTickByShift(3).m_bid;
}
void OnDeinit(const int reason){delete listOfTicks;}
If you need really unlimited number of operations - probably 2^31-1 would be enough for you, to speed up you may think of listOfTicks.Step(1000); to have 1000 empty slots and do not resize(=copy all to the new location) the array every tick.
answered Nov 12 at 20:16
Daniel Kniaz
2,2502715
It is possible to have an array of primitives in MQL4, the problem here is that you will have to copy them all each tick which is waste of time and resources. If you want to save some more advanced data (let's say MqlTick), you have to store it as the structure or create a class and save classes. It should be really senseless to copy all objects, that is why you should think of applying CList or CArrayObj and adding objects to the end. Simple magic would help to call element with index 0:
#include <ArraysArrayObj.mqh>
class CTick : public CObject{
public: double m_bid, m_ask;
CTick(const double bid,const double ask):m_bid(bid),m_ask(ask){}
};
CArrayObj *listOfTicks;
CTick *getTickByShift(const int shift=0)
{
return listOfTicks.At(listOfTicks.Total()-1-shift));
}
int OnInit(){
listOfTicks=new CArrayObj();
return(1);
}
void OnTick(){
listOfTicks.Add(new CTick(Bid,Ask));
//example of accessing ticks 0 and 3, keep in mind you do not have 3 at start!
double bid0=getTickByShift(0).m_bid;
double ask3=getTickByShift(3).m_bid;
}
void OnDeinit(const int reason){delete listOfTicks;}
If you need really unlimited number of operations - probably 2^31-1 would be enough for you, to speed up you may think of listOfTicks.Step(1000); to have 1000 empty slots and do not resize(=copy all to the new location) the array every tick.
answered Nov 12 at 20:16
Daniel Kniaz
2,2502715
edited Nov 12 at 22:07
answered Nov 12 at 20:16
Daniel Kniaz
2,2502715
answered Nov 12 at 20:16
Daniel Kniaz
2,2502715
answered Nov 12 at 20:16
Daniel Kniaz
2,2502715
2,2502715
I don't really need "infinite", just one for every bar, so for long back-tests it will require a lot. It's actually running on every bar, not on every tick, but I already have the code for that so I didn't include it in the info. Your answer looks very promising and I shall try it :)
– Wayne Filkins
Nov 12 at 20:54
2^31 should do the trick
– Wayne Filkins
Nov 12 at 20:55
What i'm really trying to do is add the equivalent of how high and low work. For high you can go high[5] or high[400] to grab previous candle highs, and i'm trying to basically make my own variables that do that. I have one that changes constantly based on different conditions, and I need to be able to go var[5] or var[50] at any given time. So like a series in tradingview (converting my tradingview script to mql4)
– Wayne Filkins
Nov 12 at 20:58
This is what I got with that code: i.imgur.com/RTrihke.png
– Wayne Filkins
Nov 12 at 21:21
addvoid OnDeInit(const int reason){delete(listOfTicks);}in order to kill remaining objects at end
– Daniel Kniaz
Nov 12 at 22:07
|
show 3 more comments
I don't really need "infinite", just one for every bar, so for long back-tests it will require a lot. It's actually running on every bar, not on every tick, but I already have the code for that so I didn't include it in the info. Your answer looks very promising and I shall try it :)
– Wayne Filkins
Nov 12 at 20:54
2^31 should do the trick
– Wayne Filkins
Nov 12 at 20:55
What i'm really trying to do is add the equivalent of how high and low work. For high you can go high[5] or high[400] to grab previous candle highs, and i'm trying to basically make my own variables that do that. I have one that changes constantly based on different conditions, and I need to be able to go var[5] or var[50] at any given time. So like a series in tradingview (converting my tradingview script to mql4)
– Wayne Filkins
Nov 12 at 20:58
This is what I got with that code: i.imgur.com/RTrihke.png
– Wayne Filkins
Nov 12 at 21:21
addvoid OnDeInit(const int reason){delete(listOfTicks);}in order to kill remaining objects at end
– Daniel Kniaz
Nov 12 at 22:07
I don't really need "infinite", just one for every bar, so for long back-tests it will require a lot. It's actually running on every bar, not on every tick, but I already have the code for that so I didn't include it in the info. Your answer looks very promising and I shall try it :)
– Wayne Filkins
Nov 12 at 20:54
I don't really need "infinite", just one for every bar, so for long back-tests it will require a lot. It's actually running on every bar, not on every tick, but I already have the code for that so I didn't include it in the info. Your answer looks very promising and I shall try it :)
– Wayne Filkins
Nov 12 at 20:54
2^31 should do the trick
– Wayne Filkins
Nov 12 at 20:55
2^31 should do the trick
– Wayne Filkins
Nov 12 at 20:55
What i'm really trying to do is add the equivalent of how high and low work. For high you can go high[5] or high[400] to grab previous candle highs, and i'm trying to basically make my own variables that do that. I have one that changes constantly based on different conditions, and I need to be able to go var[5] or var[50] at any given time. So like a series in tradingview (converting my tradingview script to mql4)
– Wayne Filkins
Nov 12 at 20:58
What i'm really trying to do is add the equivalent of how high and low work. For high you can go high[5] or high[400] to grab previous candle highs, and i'm trying to basically make my own variables that do that. I have one that changes constantly based on different conditions, and I need to be able to go var[5] or var[50] at any given time. So like a series in tradingview (converting my tradingview script to mql4)
– Wayne Filkins
Nov 12 at 20:58
This is what I got with that code: i.imgur.com/RTrihke.png
– Wayne Filkins
Nov 12 at 21:21
This is what I got with that code: i.imgur.com/RTrihke.png
– Wayne Filkins
Nov 12 at 21:21
add
void OnDeInit(const int reason){delete(listOfTicks);} in order to kill remaining objects at end– Daniel Kniaz
Nov 12 at 22:07
add
void OnDeInit(const int reason){delete(listOfTicks);} in order to kill remaining objects at end– Daniel Kniaz
Nov 12 at 22:07
|
show 3 more comments
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