lots of changes for merge

1 files changed, 15 insertions, 0 deletions

diff --git a/lib/rand.c b/lib/rand.c
new file mode 100644
index 0000000..16aeba4
--- /dev/null
+++ b/lib/rand.c
@@ -0,0 +1,15 @@
+
+#include "fracture.h"
+
+long double rand_dist_pow(const gsl_rng *r, double beta) {
+	long double x = 0;
+
+	// underflow means that for very small beta x is sometimes identically zero,
+	// which causes problems
+	while (x == 0.0) {
+		long double y = logl(gsl_rng_uniform_pos(r)) / beta;
+		x = expl(y);
+	}
+
+	return x;
+}