Re: change standard deviation of normal or Gaussian distribution (faq 13.20)

:) I understand what you mean. Maybe I didnt express myself clear
enough. I wanted to use to following method as mentioned in FAQ:

double gaussrand()
{
static double V1, V2, S;
static int phase = 0;
double X;

if(phase == 0) {
do {
double U1 = (double)rand() / RAND_MAX;
double U2 = (double)rand() / RAND_MAX;

V1 = 2 * U1 - 1;
V2 = 2 * U2 - 1;
S = V1 * V1 + V2 * V2;
} while(S >= 1 || S == 0);

X = V1 * sqrt(-2 * log(S) / S);
} else
X = V2 * sqrt(-2 * log(S) / S);

phase = 1 - phase;

return X;
}

Now I wonder, whether I can multiply the standard deviation of e.g.
0.5 with X or with which variable (v1, v2, etc.) I need to multiply
it?
Thanks a lot.

.