citation for catenary solution added

GazzolaLab · Feb 23, 2024 · 9698a3a · 9698a3a
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diff --git a/examples/CatenaryCase/post_processing.py b/examples/CatenaryCase/post_processing.py
@@ -44,9 +44,11 @@ def plot_video(
 
 
 def plot_catenary(plot_params: dict, xlim=(0, 1), ylim=(-0.5, 0.5), base_length=1.0):
+    """
+    Catenary analytical solution from Routh, Edward John (1891). "Chapter X: On Strings". A Treatise on Analytical Statics. University Press.
+    """
     matplotlib.use("TkAgg")
     position = np.array(plot_params["position"])
-    n_elem = position.shape[-1]
     lowest_point = np.min(position[-1][2])
     x_catenary = np.linspace(0, base_length, 100)
 

diff --git a/examples/README.md b/examples/README.md
@@ -79,7 +79,7 @@ Examples can serve as a starting template for customized usages.
     * __Purpose__: Demonstrate simulation of ring rod.
     * __Features__: RingCosseratRod, OneEndFixedRod, GravityForce
 * [CatenaryCase](./CatenaryCase)
-    * __Purpose__: Demonstrate simulation of cosserat rod under gravity with fixed ends.
+    * __Purpose__: Demonstrate simulation of cosserat rod under gravity with fixed ends, compared with Catenary Analytical Solution from Routh, Edward John (1891). [<strong>"Chapter X: On Strings".</strong>](https://books.google.com/books?id=3N5JAAAAMAAJ&pg=PA315#v=onepage&q&f=false). A Treatise on Analytical Statics. University Press.
     * __Features__: CosseratRod, FixedConstraint, GravityForce
 
 ## Functional Examples