d_gauss.c
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			#include<math.h>
			#include<fonction.h>

			/* -------------------------------------------------------------------
			double gauss()

			purpose: draw numbers under an gaussian law
			-------------------------------------------------------------------*/

			double d_gauss(double sig, int *idum)
			{
			double x, z, r;

			while ( (z = pow(x = d_random(idum) - 0.5, 2.0) + pow(d_random(idum) - 0.5, 2.0) ) > 0.25 );
			while ((r = d_random(idum)) <= 0.0);

			return sigsqrt(-2.0log(r) / z)*x;

			}

R1448/ChiBenchmark/lenstoolchi/src/d_gauss.cc99f2e455a51gridgradient_gilles