- various fixes

src/view.rs

@@ -1197,14 +1197,23 @@ impl<D: Dimension, R: Reader> View<D, R> {
                 let _ = out.insert(a);
             }
         }
-        let mut n = 1;
-        for (ax, size) in self.shape().to_hashmap().into_iter() {
-            if ((ax == Axis::C) || (ax == Axis::Z) || (ax == Axis::T))
-                && let Some(Operation::Mean) = self.operations.get(&ax)
-            {
-                n *= size;
-            }
-        }
+        let n = if let Some((&ax, op)) = op_czt.first()
+            && *op == Operation::Mean
+        {
+            self.axes
+                .iter()
+                .zip(self.slice.iter())
+                .find(|(a, _)| **a == ax)
+                .and_then(|(_, s)| match s {
+                    SliceInfoElem::Slice { start, end, step } => {
+                        end.map(|e| (((e - start).max(0) / step) as usize).max(1))
+                    }
+                    _ => Some(1),
+                })
+                .unwrap_or(1)
+        } else {
+            1
+        };
         let array = if n == 1 {
             out.take().unwrap()
         } else {