AccountFreeMarginCheck & AccountFreeMargin MT4 problem

New comment
  
void OnTick()
  {
      double vol=0.01;
      Print("AccountFreeMargin before:",DoubleToStr(AccountFreeMargin()));
      Print("AccountFreeMarginCheck:",DoubleToStr(AccountFreeMarginCheck(Symbol(),OP_BUY,vol)));
      OrderSend(Symbol(),OP_BUY,vol,Ask,0,0,0,"test",0,0,Blue);
      Print("AccountFreeMargin immediately after:",DoubleToStr(AccountFreeMargin()));

   return;
  }


output:

0       17:01:20        2014.01.02 02:00  test2 AUDUSD,M1: AccountFreeMargin before:100.00000000
0       17:01:20        2014.01.02 02:00  test2 AUDUSD,M1: AccountFreeMarginCheck:98.00000000
2       17:01:20        2014.01.02 02:00  test2 AUDUSD,M1: open #1 buy 0.01 AUDUSD at 0.88851 ok
0       17:01:20        2014.01.02 02:00  test2 AUDUSD,M1: AccountFreeMargin immediately after:97.77000000


https://docs.mql4.com:

AccountFreeMarginCheck() - Returns free margin that remains after the specified order has been opened at the current price on the current account.

AccountFreeMargin() - Returns free margin value of the current account.

As I understand AccountFreeMarginCheck() call before opening an order should return the same value as AccountFreeMargin() straight after the order was opened


Why AccountFreeMarginCheck() does not match AccountFreeMargin()? What am I doing wrong?

Thanks!

 
You are forgetting about the spread. The moment you open a buy, you are now down by the spread. Open a sell and they would match because you pay the spread when it closes.
  
0       15:47:56        2014.01.02 02:00  test2 AUDUSD,M1: AccountFreeMargin before:100.00000000
0       15:47:56        2014.01.02 02:00  test2 AUDUSD,M1: AccountFreeMarginCheck:98.00000000
2       15:47:56        2014.01.02 02:00  test2 AUDUSD,M1: open #1 buy 0.01 AUDUSD at 0.88851 ok
0       15:47:56        2014.01.02 02:00  test2 AUDUSD,M1: AccountFreeMargin immediately after:97.77000000
0       15:47:56        2014.01.02 02:00  test2 AUDUSD,M1: Spread:23.00000000


Hm, now it makes sence.

Thank you for clarification, you helped alot!


Does it mean that AccountFreeMargin() would be different across time whith floating spread broker?

 
zversky:


Hm, now it makes sence.

Thank you for clarification, you helped alot!


Does it mean that AccountFreeMargin() would be different across time whith floating spread broker?

Yes
New comment
Reason: