diffY

Differentiate a gridded field in the periodic y direction.

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Declaration

 derivative = diffY(field,options)

Parameters

• field gridded field with the transform’s spatial shape
• options.n derivative order; default 1

Returns

• derivative y derivative with the same shape as field

Discussion

Differentiate a gridded field in the periodic y direction.

The derivative is evaluated spectrally. The input and output retain the same spatial layout, and derivative order n defaults to 1.

dudy = wvt.diffY(u);