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Add barycentric interpolation to PhysEvaluate

Vidhi Zala requested to merge feature/barycentricInterpolation into master

Changes PhysEvaluate routines to use barycentric interpolation vs. the generation of an interpolation matrix. Evaluations in 1D are therefore reduced to O(n) complexity. Additionally adds the further term of PhysEvaluateBasis which evaluates basis at an arbitrary point in a similar manner. New demos are included in StdRegions to test the code.

Edited by Dave Moxey

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