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Order entry Script with memory?

  • #21
  • Dec 27, 2009 7:14pm Dec 27, 2009 7:14pm
Hayseed, I tried to create a script that would automatically calculate the Lot size based on a risk percent which in turn is generated using a SL input and the account balance. I get one error about an expected "double".

Sorry guys, I wish I were better at this and didn't need to ask so many questions.

Here is the code I am trying to use to set the GlobalVariable. I need to beable to allow a user to set the Risk Percent and have the script generate the rest.

Inserted Code
//+------------------------------------------------------------------+
//|                                                                                             |
//|                                                                                             |
//|                                                                                             |
//+------------------------------------------------------------------+
//#property copyright ""
//#property link      ""

#property show_inputs
 
double Lots = 0.01;
bool   UseMoneyMgmt = True;
extern double RiskPercent = 2;
extern double StopLoss = 15;
string Input = " Buy Price ";
//+------------------------------------------------------------------+
//| script program start function                                    |
//+------------------------------------------------------------------+
int start()
  { 
  double Risk = RiskPercent / 100;
  if (UseMoneyMgmt)  
   Lots = NormalizeDouble( AccountBalance()*Risk/StopLoss/(MarketInfo(Symbol(), MODE_TICKVALUE)),2); 
  if(Lots > 0; GlobalVariableSet(string ordersize, double Lots,);
     
   return(0);
  }
//+------------------------------------------------------------------+
  • #22
  • Dec 27, 2009 7:26pm Dec 27, 2009 7:26pm
hey clay.... changed it up some........ holler back if ya need more help.....h

Inserted Code
 
 
#property show_inputs
 
       double Lots              =          0.01;
       bool   UseMoneyMgmt      =          True;
extern double RiskPercent       =             2;
extern double StopLoss          =            15;
       string Input             = " Buy Price ";
//+------------------------------------------------------------------+
//| script program start function                                    |
//+------------------------------------------------------------------+
int start()
  { 
  double Risk = RiskPercent / 100.0;
  if (UseMoneyMgmt)  
   Lots = NormalizeDouble( AccountBalance()*Risk/StopLoss/(MarketInfo(Symbol(), MODE_TICKVALUE)),2); 
  if(Lots > 0) GlobalVariableSet("ordersize",Lots);
 
   return(0);
  }
to trade and code, keep both simple... no call to impress....h
  • #23
  • Dec 27, 2009 8:11pm Dec 27, 2009 8:11pm
Worked like a champ Hayseed. Now I'll see about retrieving taht variable to execute the buy or sell each time after it's set for the session. That should make Money Management a breeaze for me and anyone else who used this sort of risk based MM.

Awesome guys, awesome and thank you BOTH for the great input.

Clay
  • #24
  • Dec 27, 2009 8:32pm Dec 27, 2009 8:32pm
hey clay.... when your trying to draw the lotsize from a prior order to set the global , you can using something like below..... it finds the last lot size, sets/creates the global variable, retrieves the global variable and then uses it.....

the alert message allows you to verify lot size, for safety sake.....

this assumes the order is still open..... if it's the last closed order the code will be slightly changed....... h

Inserted Code
 
 
//+------------------------------------------------------------------+
//|                                                         Clay.mq4 |
//|                                                           .....h |
//|                                                 hayseedville.com |
//+------------------------------------------------------------------+
#property copyright ".....h"
#property link      "hayseedville.com"
#include <stdlib.mqh>
#include <WinUser32.mqh>
//+------------------------------------------------------------------+
//| script program start function                                    |
//+------------------------------------------------------------------+
int start()
  { 
   int    OpenTime  = 0;
 double LastLots  = 0;
 
 for(int cnt=0;cnt<OrdersTotal();cnt++)
   {
   OrderSelect(cnt, SELECT_BY_POS, MODE_TRADES);
   if (OrderOpenTime() >= OpenTime) 
      {   
         OpenTime = OrderOpenTime();
   LastLots = OrderLots();
   }
     }
 
     GlobalVariableSet("lotsize",LastLots);
 
     double lots = GlobalVariableGet("lotsize");
   if(MessageBox("Global Variable Lot Size  =  "+ lots +" Ok? ",
                 "Script",MB_YESNO|MB_ICONQUESTION)!=IDYES) return(1);
//----
   int ticket=OrderSend(Symbol(),OP_SELL,lots,Bid,3,0,0,"Using Last Lot Size",120000,0,CLR_NONE);
 
   return(0);
  }
to trade and code, keep both simple... no call to impress....h
  • #25
  • Dec 27, 2009 8:48pm Dec 27, 2009 8:48pm
OK,,, nailed it now. Thank you both, Ronald and Hayseed for all your input.

I have attached the three scripts for anyone to use. One sets the ordersize in global variables for use during the trading session. It sets that based on a risk level set internally that can be changes if desired when the script is clicked on.

The other two execute either a buy or a sell using that lot size until the trader decides to either increase or decrease it with the first script. Goth set a SL and a TP based also on an internal setting. They do not show the inputs because they are intended for immediate execution for faster entries.

The last two set or move the SL and TP to the point on the chart where you drop them.

Aaaaaaaaaaaaahhh,,, money management made simple, at last, well,,, at least for me,,,,
Attached File(s)
File Type: mq4 A_SetLotSize.mq4   < 1 KB | 287 downloads
File Type: mq4 A_Buy.mq4   < 1 KB | 262 downloads
File Type: mq4 A_Sell.mq4   < 1 KB | 277 downloads
File Type: mq4 ASL Set-Move.mq4   1 KB | 278 downloads
File Type: mq4 ATP Set-Move.mq4   1 KB | 276 downloads
  • #26
  • Mar 19, 2010 7:00am Mar 19, 2010 7:00am
I have a question hayseed,,, on the script that sets the global variable, I had a report that it was trying to set a "fractional" lot size, which would be problematic on some borkers. Is there a simple way to add a 'rounding' function so it only attempts to open full lots,,, i.e. rounded down the the nearest lot size allowed?

God bless
  • #27
  • Mar 19, 2010 7:42am Mar 19, 2010 7:42am
hey clay.... the MathRound function would round to nearest whole number and you could use a minimum lot size in case if it was something small like 0.01....

give me a holler if you need help with it......h
to trade and code, keep both simple... no call to impress....h
  • #28
  • Mar 19, 2010 8:43am Mar 19, 2010 8:43am
regarding lot size, there is one called lot step. from MT4 Lang ref:

MODE_LOTSTEP Step for changing lots.

for example,
minlot = 0.1 (the lowest allowable lot size)
lotstep = 0.01.
it means we can open 0.1, 0.11, 0.12, 013 lot

my favorite way to make sure the calculated lot size is valid:

after make lot calculation, like in one of your scripts:
Lots = NormalizeDouble( AccountBalance()*Risk/StopLoss/(MarketInfo(Symbol(), MODE_TICKVALUE)),2);
add this :
double LotStep = MarketInfo(Symbol(),MODE_LOTSTEP);
double MinLot = MarketInfo(Symbol(),MODE_MINLOT);
Lots = MathRound(Lots/LotStep)*LotStep; //change weird lot size like 0.2678 to 0.27, here the smallest step is 0.01
Lots = MathMax(Lots,MinLot) //if lot size < 0.1, it rounded up to 0.1

hope this help
  • #29
  • Last Post: Mar 23, 2010 3:48pm Mar 23, 2010 3:48pm
Hi guys,, sorry I didn't respond. I was busy with some things. I'll look at the scripts and see what I can do.

I'll get back on it though as soon as I can.

thanks
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