report: handle asking the variance of only one data point

scipy freaks out otherwise

1 files changed, 10 insertions, 2 deletions

diff --git a/utils/ezbench.py b/utils/ezbench.py
index 375146f..373b1b3 100644
--- a/utils/ezbench.py
+++ b/utils/ezbench.py
@@ -805,8 +805,16 @@ class BenchResult:
 
     def __compute_stats__(self):
         if self._cache_mean is None or self._cache_std is None:
-            self._cache_mean, var, self._cache_std = stats.bayes_mvs(array(self.data),
-                                                                     alpha=0.95)
+            if len(self.data) > 1:
+                self._cache_mean, var, self._cache_std = stats.bayes_mvs(array(self.data),
+                                                                         alpha=0.95)
+            else:
+                if len(self.data) == 0:
+                    value = 0
+                else:
+                    value = self.data[0]
+                self._cache_mean = (value, (value, value))
+                self._cache_std = (float("inf"), (float("inf"), float("inf")))
 
     def margin(self):
         self.__compute_stats__()