# Interpolate 2D Scattered (G Dataflow)

Version:
Last Modified: January 9, 2017

Performs two-dimensional interpolation on scattered points.

This node accepts two independent variables and one dependent variable and returns interpolated values that correspond to each location of the independent variables.  ## method

Interpolation method.

Name Value Description
nearest 0

Performs interpolation on the nearest points (non-smooth). This method finds the point closest to (xi, yi) and assigns the corresponding value in Z to zi.

linear 1

Performs linear interpolation on the selected triangle (non-smooth). This method triangulates the convex hull of (X, Y) and interpolates zi for the points inside a triangle. (xi, yi) is valid only inside the convex hull of (X, Y). Otherwise, this node returns NaN.

cubic 2

Performs cubic interpolation on the selected triangle (smooth). This method triangulates the convex hull of (X, Y) and interpolates zi for the points inside a triangle. (xi, yi) is valid only inside the convex hull of (X, Y). Otherwise, this node returns NaN.

biharmonic spline 3

Performs biharmonic spline interpolation (smooth). This method calculates 2D biharmonic spline interpolation using Green's function.

Default: linear ## Z

Value of the known points.

X, Y, and Z must be the same size. ## X

X-coordinates of the known points.

X, Y, and Z must be the same size. ## Y

Y-coordinates of the known points.

X, Y, and Z must be the same size. ## error in

Error conditions that occur before this node runs. The node responds to this input according to standard error behavior.

Default: No error ## xi

X-coordinates of the new points where the node computes interpolated values at zi. ## yi

Y-coordinates of the new points where interpolated values compute at yi. The size of yi must equal the size of xi. ## zi

Interpolated values of the new points that correspond to the xi and yi values. ## error out

Error information. The node produces this output according to standard error behavior.

Where This Node Can Run:

Desktop OS: Windows

FPGA: Not supported