How can I make a random number

[palepalepale]

I need a number from 0.00 to 1.00 completly random, is that too much to ask?

MathRand() is not working for me, please help.

[palepalepale]

ok I just did

Rand=(MathRand()*100)/32767

That will give me a random number from 0 to 100. But an integer not a double.

[Amir Yacoby]

So do it twice for the integer and fraction parts 

Double=Int+Fraction/100

[Dominik Egert]

Here you go:

//+------------------------------------------------------------------+
//| Random value in the range [min, max]                             |
//| Generates random numbers with a uniform distribution (bias-free).|
//| Maximum granularity of generator is 32768 values.                |
//+------------------------------------------------------------------+
template
<typename T>
T random(const T min, const T max)
{ return((T)((double)min + (((double)MathRand() / 32767.0) * (double)(max - min)))); }

 Best regards

[Amir Yacoby]

Or just use (for 0 to 1 doubles)

double d=MathMod(MathRand(),100)/100;

[Dominik Egert]

Amir Yacoby:

Or just use (for 0 to 1 doubles)

You know this will limit your values to a max of 100. 

So the granularity of your random number is 0.01. Starting at 0.00, going in steps of 0.01 to 0.99.

Just saying.

[Amir Yacoby]

Dominik Egert:

You know this will limit your values to a max of 100. 

So the granularity of your random number is 0.01. Starting at 0.00, going in steps of 0.01 to 0.99.

Just saying.

It is exactly as the OP requested - double numbers 0.00 to 0.99

Actually - if 1 is included in the desired scope than should be changed to 

double d=MathMod(MathRand(),101)/100;

[palepalepale]

OMG you guys are awesome, thank you so much, I hope you find true love or win the lottery or something. Thanks.

[Dominik Egert]

Amir Yacoby:

It is exactly as the OP requested - double numbers 0.00 to 0.99

Actually - if 1 is included in the desired scope than should be changed to 

Although your first answer is not >exactly< meeting the request, I like the idea of specifying the granularity.

Therefore I integrated it into the function as shown here:

//+------------------------------------------------------------------+
//| Random value in the range [min, max]                             |
//| Generates random numbers with a uniform distribution (bias-free).|
//| Granularity of generator is at max 32768 values.                 |
//+------------------------------------------------------------------+
template
<typename T>
T random(const T min, const T max, const double granularity = 32768.0)
{ return((T)((double)min + ((MathMod(MathRand(), granularity) / (granularity - 1.0) * (double)(max - min)))); }

[Denis Kirichenko]

MQL5 has its own.

[amando]

int Zufallszahl()
  {
   int Zufall = -1;
   int BoS = MathRand() % 2;     // Zufallszahl für Zufallsorder mit 0 und 1 auswählen

   if(BoS ==0)
      LongTrade(true,_Symbol,0.01);
   else
      ShortTrade(true,_Symbol,0.01);
   return(BoS);
  }
//+----------------------------------------