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second order interpolation

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Old   April 21, 2010, 12:22
Question second order interpolation
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Hello guys
I have 2D function and want to do second order interpolation, any body knows the formula?
Thanks.
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Old   April 22, 2010, 08:36
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Try to use a second order 2D polynomial, fit this to your data points and then use least squares to obtain the coefficients, this will work on kind of grids.

Or search in a numerical methods book for 2D interpolations (if I remember well there is a Lagrange formula for regular grids).

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