Originally posted by: VictoireD.

Hello,

I would like to update the seed for generating random numbers, in the main section. My understanding is that the function Opl.srand is specifically for the model part, not for the main. 

Thanks in advance for your help,

Victoire D.

Hi,

in the main part you may use

Opl.srand();

and that will change the random seed for Opl.rand()

regards

Originally posted by: VictoireD.

Hi Alex,

Thanks. Just to be sure, this will also change the seed for Math.random?

Best regards,

Victoire

Hi,

no, it will change the random seed for Opl.rand only

int a=srand(1);

execute
{
a;
}

range r=1..10;
int b[i in r]=rand(10);
int b2[i in r];
float c[r];

execute
{
for(var i in r)
{
b2[i]=Opl.rand(10);

c[i]=Math.random();
}
writeln("a= ",a);
writeln("b= ",b);
writeln("b2= ",b2);
writeln("c= ",c);
}

gives

a= 1
b=  [8 2 9 0 2 7 3 7 0 8]
b2=  [2 2 2 1 4 9 6 8 5 0]
c=  [0.0012512 0.56357 0.1933 0.80872 0.58499 0.47986 0.35028 0.89594 0.82281 0.74658]

but if I change to

int a=srand(2);

I get

a= 2
b=  [7 2 3 4 8 5 4 0 4 2]
b2=  [2 3 2 6 0 9 9 1 3 5]
c=  [0.0012512 0.56357 0.1933 0.80872 0.58499 0.47986 0.35028 0.89594 0.82281 0.74658]

regards

Originally posted by: VictoireD.

Got it, thanks.