Use the "gradient of unstructured data set" filter to output the vorticity

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How do I know what equation is used for the “gradient of an unstructured data set”?

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Please see the following discussion: Numerics of "Gradient Of Unstructured DataSet" Filter. It points to the section of code where the gradient in this filter is computed.

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Hi! Kenneth Moreland
Do you know what algorithm that compute vorticity in the “Gradient of unstructured Data Set” Filter?

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Here’s the code that computes the vorticity from the gradient of a vector field.