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**Owning Palette:** Array Functions

**Requires:** Base Development System

Interpolates points in a 1D array that represents a 2D non-descending graph. This function compares **threshold y** to the values in **array of numbers or points** starting at **start index** until it finds a pair of consecutive elements such that **threshold y** is greater than or equal to the value of the first element and less than or equal to the value of the second element.

The connector pane displays the default data types for this polymorphic function.

This function calculates the fractional distance between the first value and **threshold y** and returns the fractional index at which **threshold y** would be placed within **array of numbers or points** using linear interpolation.

Note Use this function only with arrays sorted in non-descending order. |

This function does not recognize the index of a negative slope crossing, and it might return incorrect data if **threshold y** is less than the value at **start index**. Use the Threshold Detector VI for more advanced analysis of arrays.

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