Merge pull request #471 from RocketPy-Team/bug/find-input-root

BUG: Fix find_input() Function to Return a Single Value

Author: Gui-FernandesBR

rocketpy/mathutils/function.py

@@ -2648,7 +2648,7 @@ def find_input(self, val, start, tol=1e-4):
             The value of the input which gives the output closest to val.
         """
         return optimize.root(
-            lambda x: self.get_value(x) - val,
+            lambda x: self.get_value(x)[0] - val,
             start,
             tol=tol,
         ).x[0]