Home > Support > NI Product Manuals > LabVIEW Communications System Design Suite 1.0 Manual

Linearly interpolates a decimal y value from an array of numbers or points using a specified fractional index or x value.



An array of numbers or an array of points where each point is a cluster of x and y coordinates.

If this input is an array of points, the node uses the first element in the cluster (x) to obtain a fractional index by linear interpolation. The node then uses this fractional index to compute the output y value from the second cluster element (y).


fractional index or x

The index or x-value at which the node should return a y-value.fractional index or x must be located directly on a point or between two points for the node to work correctly.

fractional index or x does not interpolate beyond the bounds of an array or data point set. For example, if the parameter is set lower than the first element or x-value in an array, the node returns the value of the first element or the y-value of the first data point. Similarly, if the parameter is set too high, the node returns the value in the final element or the final y-value.


y value

The interpolated value of the element at the fractional index or the interpolated y-value of the fractional data point in array.