Revert "DOC: gradient uses 1st order central difference in the interior" #8606
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I think some clarification of terminology is needed. The first order central difference (first derivative) is indeed second order in the error, so the first reversion here is correct as it refers to the error. I think the later corrections could use more explanation for clarity. Don't call this a reversion, just call it something like |
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@apbard You can make this correction in your other PR when you rebase. |
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Reverts #8605
Beside the typo
2stI think that the docs were right before. The function is using central finite differences with a 3 point stencil. That scheme, for uniformly spaced data, is actually of 2nd order.