3-d order derivative
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there is the following problem with the calculation of a 3-d order derivative.
I have two vectors of lambda and refractive index, respectively. I take the 3-d order derivative using a gradient().
When I use a relatively small number of points (for example 3000) , I get a smooth plot.
In the case of more points (30 000) there is some oscillation in the plot.
What is the reason of such behavior?
Thank you a lot.