Works on the assumption that ordered x array is in monotonically increasing or decreasing order and can therefore efficiently search for the relative index of the location of x value within the x array. The VI starts the search at the starting index and begins by using a fast hunting phase to roughly bracket the location and then narrows to the final bracket using a bisection search. The VI computes the fractional index location by using linear interpolation.


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Inputs/Outputs

  • c1ddbl.png ordered x array —

    ordered x array is the array of tabulated values of the dependent variable and must be monotonically increasing or decreasing.

  • cdbl.png x value —

    x value is the value whose relative location the VI needs to find within the x array.

  • ci32.png starting index —

    starting index is the assumed initial search location. This value is usually set to the index of a previous search when the values to locate tend to be near each other in subsequent searches. The closer the starting index is to the true location of x value, the faster the search.

  • idbl.png fractional index —

    fractional index is the relative index value of location of x value within the x array.