GoldExI : FAQ : How GoldExI calculates Rn

Question

How GoldExI calculates R_n in Math | Rn & Ic and Math | Resistance Histogram functions?

Answer

To calculate the resistance GoldExI simply connects the first and the last points of the curve by a straight line. The slope of this line is used as resistance value. GoldExI automatically detects where the current axis is by searching for "A" units.

For curves measured in both directions GoldExI draws an imaginary straight line which connects the first point and the middle point of the curve. Note, that this gives good results only when the curve has more or less equal number of points in both directions.

To understand whether the curve is one or two directional GoldExI uses the following simple test: if |x_n-x₁|<max(|x_n|,|x₁|) (x_i is the current in i-th point) then it is two directional curve. Note that this criteria works well only for curves which have both positive and negative values of current.