-SCS Parameter Analyzer Reference Manual Section 6:
4200A-901-01 Rev. C / February 2017 6-259
POLYNFIT Formulator function
POLYNFIT (n
th
order) does polynomial approximation from the 1st order to the 9th order.
Usage
POLYNFIT(VX, VY, ORDER, STARTPOS, ENDPOS)
The name of any column (vector) listed under Columns
The name of any column (vector) listed under Columns
The order
The row number (index) of the first set of X and Y values
The row number (index) of the second set of X and Y values
Details
Enables quadratic regression line fitting. It allows a set of data to best fit an equation of the parabola
Y = aX
2
+ bX + c.
The a, b, and c values of the quadratic equation are returned.
The quadratic regression line fit functions are useful for deriving the defect density when you use the
drive-level capacitance profiling (DLCP) technique.
If a VX or VY value at either STARTPOS or ENDPOS is an invalid number (that is, the value is #REF),
the function will not return a valid result.
Also see
POLY2COEFF (on page 6-257)
POLY2FIT (on page 6-258)
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