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Asked: 2026-06-13T02:17:57+00:00

Possible Duplicate: Generating a random Gaussian double in Objective-C/C Is there any way of

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Possible Duplicate:
Generating a random Gaussian double in Objective-C/C

Is there any way of getting a random number not from a uniform distribution, but from a Gaussian (Normal, Bell Curve) distribution in iOS? All the random number generators I have found are basically uniform and I want to make the numbers cluster around a certain point. Thanks!

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1 Answer

  1. Editorial Team

    Just use a uniform distribution generator and apply the Box-Muller Transform:

    double u1 = (double)arc4random() / UINT32_MAX; // uniform distribution
double u2 = (double)arc4random() / UINT32_MAX; // uniform distribution
double f1 = sqrt(-2 * log(u1));
double f2 = 2 * M_PI * u2;
double g1 = f1 * cos(f2); // gaussian distribution
double g2 = f1 * sin(f2); // gaussian distribution
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