---------------------------------------------------------------------------
ValueError                                Traceback (most recent call last)
~\Anaconda3\lib\site-packages\pandas\core\indexes\range.py in get_loc(self, key, method, tolerance)
    384                 try:
--> 385                     return self._range.index(new_key)
    386                 except ValueError as err:

ValueError: 3172 is not in range

The above exception was the direct cause of the following exception:

KeyError                                  Traceback (most recent call last)
~\AppData\Local\Temp/ipykernel_15096/1027908910.py in <module>
----> 1 frac_index = frac_point(x, y)
      2
      3 plt.plot(eng_strain, eng_stress)
      4 plt.plot(eng_strain[frac_index], eng_stress[frac_index], "s")
      5 plt.title('Engeeniring Stress-Strain curve')

~\AppData\Local\Temp/ipykernel_15096/1453283826.py in frac_point(x, y)
     17     for i in range(len(reversed_x)):
     18         x1 = reversed_x[i]
---> 19         x2 = reversed_x[i+1]
     20         y1 = reversed_y[i]
     21         y2 = reversed_y[i+1]

~\Anaconda3\lib\site-packages\pandas\core\series.py in __getitem__(self, key)
    940
    941         elif key_is_scalar:
--> 942             return self._get_value(key)
    943
    944         if is_hashable(key):

~\Anaconda3\lib\site-packages\pandas\core\series.py in _get_value(self, label, takeable)
   1049
   1050         # Similar to Index.get_value, but we do not fall back to positional
-> 1051         loc = self.index.get_loc(label)
   1052         return self.index._get_values_for_loc(self, loc, label)
   1053

~\Anaconda3\lib\site-packages\pandas\core\indexes\range.py in get_loc(self, key, method, tolerance)
    385                     return self._range.index(new_key)
    386                 except ValueError as err:
--> 387                     raise KeyError(key) from err
    388             raise KeyError(key)
    389         return super().get_loc(key, method=method, tolerance=tolerance)

KeyError: 3172