• dgamma(x, s)—Returns the probability density for value x.

• pgamma(x, s)—Returns the cumulative probability distribution for value x.

• qgamma(p, s)—Returns the inverse cumulative probability distribution for probability p.

• rgamma(m, s)—Returns a vector of m random numbers having the gamma distribution.

• x is a scalar or vector of real values, x > 0. To allow integration and other operations over this argument, values outside of the stated range are allowed, but they produce a 0 result.

• s is a real shape parameter, s > 0.

• p is a real probability, 0 ≤ p ≤ 1.

• m is an integer, m > 0.