# Interpolate 2D Scattered (G Dataflow)

Version:

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.

Standard Error Behavior

Many nodes provide an error in input and an error out output so that the node can respond to and communicate errors that occur while code is running. The value of error in specifies whether an error occurred before the node runs. Most nodes respond to values of error in in a standard, predictable way.

error in does not contain an error error in contains an error
If no error occurred before the node runs, the node begins execution normally.

If no error occurs while the node runs, it returns no error. If an error does occur while the node runs, it returns that error information as error out.

If an error occurred before the node runs, the node does not execute. Instead, it returns the error in value as error out.

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.

Standard Error Behavior

Many nodes provide an error in input and an error out output so that the node can respond to and communicate errors that occur while code is running. The value of error in specifies whether an error occurred before the node runs. Most nodes respond to values of error in in a standard, predictable way.

error in does not contain an error error in contains an error
If no error occurred before the node runs, the node begins execution normally.

If no error occurs while the node runs, it returns no error. If an error does occur while the node runs, it returns that error information as error out.

If an error occurred before the node runs, the node does not execute. Instead, it returns the error in value as error out.

Where This Node Can Run:

Desktop OS: Windows

FPGA: This product does not support FPGA devices