[FieldTrip] 3D spline interpolation

[Nenad Polomac]

Dear Stavros,

You should have look on this
http://fieldtrip.fcdonders.nl/tutorial/eventrelatedaveraging#calculate_the_planar_gradient.
That is an explanation how to perform it on ERF data. And here you can find
pipeline for time freq analysis.
http://fieldtrip.fcdonders.nl/tutorial/cluster_permutation_freq#procedure
The ft_megplanar and ft_combineplanar together transform axial to
planar gradients. Have look in the functions help as well.
The paper you mentioned is cited here
<http://fieldtrip.fcdonders.nl/references_to_implemented_methods#planar_gradient_computation>in
the Fildtrip documentation.

All the best!

Nenad
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