Error : Interpolation methods require data where the values in X are unique.

I am trying to do a simple interpolation. However I got an error message " Interpolation methods require data where the values in X are unique". Can you please help me figure out what is causing this error?

Answer 1

[Matt J]

The 'X' refers to the list of locations that you are trying to "interpolate between". They must contain non-repeating ascending values.