Sample from second half of chain

bilby/core/sampler/dynesty.py

@@ -643,7 +643,7 @@ def sample_rwalk_bilby(args):
 
         if accept > walks:
             act = np.max([1, autocorr_new(np.array(u_list).T)])
-        if len(u_list) > maxmcmc and accept > 0:
+        if accept + reject > maxmcmc and accept > 0:
             if max_walk_warning:
                 warnings.warn(
                     "Hit maximum number of walks {} with accept={}, reject={}, "
@@ -668,10 +668,11 @@ def sample_rwalk_bilby(args):
         v = v_list[idx]
         logl = logl_list[idx]
     else:
-        warnings.warn("Returning the last point in the chain")
-        u = u_list[-1]
-        v = v_list[-1]
-        logl = logl_list[-1]
+        idx = np.random.randint(int(len(u_list) / 2), len(u_list))
+        logger.warning("Returning random point in second half of the chain")
+        u = u_list[idx]
+        v = v_list[idx]
+        logl = logl_list[idx]
 
     blob = {'accept': accept, 'reject': reject, 'fail': nfail, 'scale': scale}