Math_Numerical_RootFinding | --Math_Numerical_RootFinding_Open | --Math_Numerical_RootFinding_fixedpoint
Math_Numerical_RootFinding_fixedpoint Math_Numerical_RootFinding_fixedpoint( [array $options = null])
float|PEAR_Error fixedpoint( callback $gxFunction, float $xR)
This method using g(x) (the modification of f(x), which g(x) = x).