Figure 2
Behaviour of the Geman–McClure function versus the quadratic (least-squares) function. For small values of r they look similar, whereas for large values of r GM is less restrictive than least squares, allowing conformational changes to occur. Black line, GM = r2/(1 + σ2r2) with σ = 0.5; red line, quadratic function r2. This figure was produced using the software package R (R Development Core Team, 2007). |