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What's the cubic interpolation in multigrid method?

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Old   September 25, 2009, 06:00
Default What's the cubic interpolation in multigrid method?
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What's the cubic interpolation in multigrid method?
Is it the same thing as cubic spline interpolation? I have found many books, but they just give a one dimensional formula and the explanations are unclear.

My grid is two dimensional. Then, what's the cubic interpolation?

Thank you.
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