Characteristic Curve - Job plot: Add items-argument for custom slicing

CHANGELOG.md

@@ -7,6 +7,7 @@ All notable changes to this project will be documented in this file. The format
 - Add a new argument to pass a mesh for the dual regions in `FieldsMixed(mesh=None)`.
 - Add quadrature and grad arguments to `RegionLagrange`.
 - Add order attribute to `RegionLagrange`.
+- Add items-argument for custom slicing of characteristic curve plots in `CharacteristicCurve.plot(items=None)`.
 
 ### Changed
 - Enhance Domain integration in `IntegralForm`: Ensure C-contiguous arrays as `fun`-argument.

src/felupe/mechanics/_curve.py

@@ -77,6 +77,7 @@ def plot(
         fig=None,
         ax=None,
         linestyle=".-",
+        items=None,
         **kwargs
     ):
 
@@ -90,8 +91,11 @@ def plot(
         if y is None:
             y = self.y
 
-        x = np.array(x)
-        y = np.array(y)
+        if items is None:
+            items = slice(None)
+
+        x = np.array(x)[items]
+        y = np.array(y)[items]
 
         if gradient:
             y = np.gradient(y, x[:, xaxis], edge_order=2, axis=0)