Rounding issues

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[Deleted]  

Hello

I try to find a way to eliminate the Tick from a given price without rounding.

For example: 1.29346, I'd like to work with the figure 1.2934

However, whatever command, NormalizeDouble, MathRound, DoubleToStr seams to work according to rounding rules.

In this case I receive a value 1.2935. My intention is to just eliminate (ignore) the 5th digit.

The desired result is 1.2934.

Any idea how I can achieve this ?


Thanks

 

What about the following:

double price1 = 1.23456;
double price2 = 0;

price2 = MathFloor(price1 / 0.0001) * 0.0001;
 
redhat:

Hello

I try to find a way to eliminate the Tick from a given price without rounding.

For example: 1.29346, I'd like to work with the figure 1.2934

However, whatever command, NormalizeDouble, MathRound, DoubleToStr seams to work according to rounding rules.

In this case I receive a value 1.2935. My intention is to just eliminate (ignore) the 5th digit.

The desired result is 1.2934.

Any idea how I can achieve this ?

You can multiply up by MathPow(10, Digits-1) then use MathFloor and then divide by MathPow(10, Digits-1) Maths Functions
 
RaptorUK:
You can multiply up by MathPow(10, Digits-1) then use MathFloor and then divide by MathPow(10, Digits-1) Maths Functions

RaptorUK how come we can't do this

  int integer; 
   double doubling;
   
   integer =  1.23456 *10000;
   doubling = integer/10000 ;
   Alert (integer," to ",DoubleToStr (doubling, 10)); // the result is 1
 
onewithzachy:

RaptorUK how come we can't do this

Got it https://docs.mql4.com/basis/types/casting I forget the english typecasting :(
[Deleted]  

Thanks guys, what you told me here delivers the desired result.


Now perhaps you can help me out with the oposit problem.

To round a value up from a value 1.29341 to a value 1.2935.

Is there a trick to do that ?

 
onewithzachy:
Got it https://docs.mql4.com/basis/types/casting I forget the english typecasting :(
There are many ways to do what the OP wanted, my suggestion was just something I knew would work for certain.
 
redhat:

Thanks guys, what you told me here delivers the desired result.


Now perhaps you can help me out with the oposit problem.

To round a value up from a value 1.29341 to a value 1.2935.

Is there a trick to do that ?

You need to be more specific about what you want to do . . . you post isn't specific enough.
 

To round a value up from a value 1.29341 to a value 1.2935.

Is there a trick to do that ?

You might try using MathCeil, using similar code that I posted in above answer. I believe MathCeil is the opposite of MathFloor, so code accordingly.

You need to be more specific about what you want to do . . . you post isn't specific enough.

I agree with Raptor for the most part. First, try to understand the problem, research the problem to find a solution (research also means trial and error), and then if you haven't found an acceptable solution, quantify the problem (with enough specifity so people here can give you appropriate answers; remember, garbage in, garbage out) here so someone (or several someones) can guide you in the right direction.

[Deleted]  

Thanks guys for the comments and support.

And Yes, the MathCeil is doing what I'm looking for. Just figured that out.

double price1 = 1.23456;
double price2 = 0;

price2 = MathCeil(price1 / 0.0001) * 0.0001;
 
Don't hard code numbers (0.0001). Adjust for 4/5 digit numbers
double price1 = 1.23456;
double price2 = MathCeil( price1 / pips2dbl) * pips2dbl; // 1.2346
double price3 = MathFloor(price1 / pips2dbl) * pips2dbl; // 1.2345
double price4 = MathRound(price1 / pips2dbl) * pips2dbl; // 1.2346

///////////
//++++ These are adjusted for 5 digit brokers.
int     pips2points;    // slippage  3 pips    3=points    30=points
double  pips2dbl;       // Stoploss 15 pips    0.015      0.0150
int     Digits.pips;    // DoubleToStr(dbl/pips2dbl, Digits.pips)
int     init(){                                             OptInitialization();
     if (Digits % 2 == 1){      // DE30=1/JPY=3/EURUSD=5 forum.mql4.com/43064#515262
                pips2dbl    = Point*10; pips2points = 10;   Digits.pips = 1;
    } else {    pips2dbl    = Point;    pips2points =  1;   Digits.pips = 0; }
    // OrderSend(... Slippage.Pips * pips2points, Bid - StopLossPips * pips2dbl
//---- These are adjusted for 5 digit brokers.
    /* On ECN brokers you must open first and THEN set stops
    int ticket = OrderSend(..., 0,0,...)
    if (ticket < 0)
       Alert("OrderSend failed: ", GetLastError());
    else if (!OrderSelect(ticket, SELECT_BY_TICKET))
       Alert("OrderSelect failed: ", GetLastError());
    else if (!OrderModify(OrderTicket(), OrderOpenPrice(), SL, TP, 0)
       Alert("OrderModify failed: ", GetLastError());
     */
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