DBeta 
This is the first order derivative function of the Beta function w.r.t x, \({\partial \over \partial x} \mathrm{B}(x, y)\).

DBetaRegularized 
This is the first order derivative function of the Regularized Incomplete Beta function, BetaRegularized , w.r.t the upper limit, x.

DErf 
This is the first order derivative function of the Error function, Erf .

Dfdx 
The first derivative is a measure of how a function changes as its input changes.

DGamma 
This is the first order derivative function of the Gamma function, \({d \mathrm{\Gamma}(x) \over dx}\).

DGaussian 
This is the first order derivative function of a Gaussian function, \({d \mathrm{\phi}(x) \over dx}\).

DPolynomial 
This is the first order derivative function of a Polynomial , which, again, is a polynomial.

FiniteDifference 
A finite difference (divided by a small increment) is an approximation of the
derivative of a function.
