## Interpolation in Excel based on Splines and Natural Neighbor Algorithm

2D (Curve) Interpolation
Use INTERPXY to:
1. Interpolate from a set of (x,y) data points.
2. Map a set of scattered (x,y) data points onto a uniform grid for curve plotting.
3D (Surface) Interpolation
Use INTERPXYZ to interpolate from a set of (x,y,z) data points.
3D Scattered data Gridding
Use GRIDXYZ to map a set of scattered (x,y,z) data points onto a uniform rectilinear grid for surface plotting.

## Description

This video demonstrates how to use the function INTERPXY to interpolate on a graph generated from discrete (x,y) data set points in both Excel and Google Sheets by the ais of splines.

## Description

This video demonstrates how to use the function INTERPXYZ to interpolate from a set of discrete (x,y,z) data points in both Excel and Google Sheets. INTERPXYZ is based on natural neighbor algorithm.

## Description

This video demonstrates how to use the function GRIDXYZ to interpolate a set of scattered (x,y,z) data points onto a uniform rectilinear grid in both Excel and Google Sheets. And, how to generate a surface plot in Excel using the interpolated grid data. GRIDXYZ is based on natural neighbor algorithm.
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