rexponential
| n : | Natural (pass by value) |
| Number of random values to draw. | |
| Default : 1 | |
| lambda : | RealPos (pass by const reference) |
| The rate parameter ( rate = 1/mean ). | |
| Default : 1 | |
| offset : | RealPos (pass by const reference) |
| The offset of the distribution. | |
| Default : 0 |