Compute rates and cumulative production values for Arps exponential decline curves.

1 2 | ```
exponential.q(qi, D, t)
exponential.Np(qi, D, t)
``` |

`qi` |
initial rate [volume / time], i.e. q(t = 0). |

`D` |
nominal Arps decline exponent [1 / time]. |

`t` |
time at which to evaluate rate or cumulative [time]. |

Assumes consistent units of time between `qi`

, `D`

, and `t`

. To convert, see the decline-rate conversion functions referenced below.

`exponential.q`

returns the rate for each element of `t`

,
in the same units as `qi`

.

`exponential.Np`

returns the cumulative production for each element of
`t`

, in the same units as `qi * t`

.

`as.effective`

, `as.nominal`

, `rescale.by.time`

.

1 2 3 4 5 | ```
## qi = 1000 Mscf/d, Di = 95% effective / year, t from 0 to 25 days
exponential.q(1000, as.nominal(0.95, from.period="year", to.period="day"), seq(0, 25))
## qi = 500 bopd, Di = 3.91 nominal / year, t = 5 years
exponential.Np(rescale.by.time(500, from.period="day", to.period="year"), 3.91, 5)
``` |

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