Mathematica Asked on January 7, 2021

I have a problem to derive an interpolation function.

I am quite new to mathematica, so I suspect I miss something.

I have a list of values of 1000 values (L) that represents a function that I want to derive.

The list looks like this :

I interpolate the list

```
InterL = Interpolation[L, InterpolationOrder -> 1]
```

I verify that the interpolation works :

```
In[399]:= InterL[400.6]
Out[399]= 686.8
```

If I plot InterL I have a similar curve as L except that is defined on everypoint.

Now if I try to derive InterL and plot it I get this curve :

Which doesn’t look like the derivative of the precedent. I have tried to evaluate the derivative, etc. I can’t find a solution.

Is it possible to derive this curve ?

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