Math_Numerical_RootFinding | --Math_Numerical_RootFinding_Open | --Math_Numerical_RootFinding_newtonraphson
Math_Numerical_RootFinding_newtonraphson Math_Numerical_RootFinding_newtonraphson( [array $options = null])
float|PEAR_Error newtonraphson( callback $fxFunction, callback $dfxFunction, float $xR)