diff options
| author | Thomas White <taw@physics.org> | 2014-10-24 15:56:13 +0200 |
|---|---|---|
| committer | Thomas White <taw@physics.org> | 2014-10-24 15:56:13 +0200 |
| commit | 1351a057519622ba2b5ee8ccf6397bd62381eeec (patch) | |
| tree | 5c9fbe0b1beb96d0ef56c19205d42e014391dd06 | |
| parent | df7f5d098196ae4d67aaf89d626682a26062caa0 (diff) | |
Avoid log(0) in gaussian_noise()
| -rw-r--r-- | libcrystfel/src/utils.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/libcrystfel/src/utils.c b/libcrystfel/src/utils.c index e09b53c3..f8f93046 100644 --- a/libcrystfel/src/utils.c +++ b/libcrystfel/src/utils.c @@ -186,9 +186,10 @@ double gaussian_noise(gsl_rng *rng, double expected, double stddev) { double x1, x2, noise; - /* A uniformly distributed random number between 0 and 1 */ - x1 = gsl_rng_uniform(rng); - x2 = gsl_rng_uniform(rng); + /* Generate two uniformly distributed random numbers between 0 and 1, + * including 1 but not 0. */ + x1 = 1.0 - gsl_rng_uniform(rng); + x2 = 1.0 - gsl_rng_uniform(rng); noise = sqrt(-2.0*log(x1)) * cos(2.0*M_PI*x2); |