Computes a set of coefficients for a polynomial that approximates the inverse of the polynomial with the coefficients you specify with the **coefficients** input. This VI generates a table of *x* versus *y* values over the range of *x*. This VI then finds a polynomial fit, using the least squares method to compute a polynomial that computes *x* when given a value for *y*.

## coefficients

**coefficients** is the array of coefficients for the polynomial that computes *y* given a value of *x*. Each element of the array corresponds to a term of the equation.

For example, if index three of the array is 9, the fourth term of the equation is 9*x*^3.

## maximum valid value of x

**maximum valid value of x** is the maximum value of *x* for which you use the polynomial. This is the largest value of *x* for which the node generates a *y* value in the table.

## minimum valid value of x

**minimum valid value of x** is the minimum value of *x* for which you use the polynomial. This is the smallest value of *x* for which the node generates a *y* value in the table.

## number of points to compute within x range

**number of points to compute within x range** is the number of points in the table of *x* versus *y* values. The VI spaces the values evenly between **minimum valid value of x** and **maximum valid value of x**.

## error in

**error in** describes error conditions that occur before this node runs. This input provides standard 'error in' functionality.

## reverse polynomial order

**reverse polynomial order** is the order of the reverse polynomial to compute. For example, an input of 3 indicates a 3rd order polynomial. A value of -1 indicates a reverse polynomial of the same order as the forward polynomial.

## reverse coefficients

**reverse coefficients** is the array of coefficients for the reverse polynomial. Each element of the array corresponds to a term of the equation. For example, if index three of the array is 9, the fourth term of the equation is 9*y*^3.

## error out

**error out** contains error information. If **error in** indicates that an error occurred before this node ran, **error out** contains the same error information. Otherwise, **error out** describes the error status that this node produces.

**Where This Node Can Run: **

Desktop OS: Windows

FPGA: LabVIEW NXG does not support FPGA devices

Web Server: Not supported in VIs that run in a web application