remove testing variable

mmcky · mmcky · commit 81a44ff1ac75 · 2025-05-14T20:09:00.000+10:00
diff --git a/lectures/kalman.md b/lectures/kalman.md
@@ -122,10 +122,6 @@ $2 \times 2$ covariance matrix.  In our simulations, we will suppose that
 
 This density $p(x)$ is shown below as a contour map, with the center of the red ellipse being equal to $\hat x$.
 
-```{code-cell} ipython3
-a
-```
-
 ```{code-cell} ipython3
 :tags: [output_scroll]
 
