| Exponential {base} | R Documentation |
Density, distribution function, quantile function and random
generation for the exponential distribution with rate rate
(i.e., mean 1/rate).
dexp(x, rate = 1, log = FALSE) pexp(q, rate = 1, lower.tail = TRUE, log.p = FALSE) qexp(p, rate = 1, lower.tail = TRUE, log.p = FALSE) rexp(n, rate = 1)
x, q |
vector of quantiles. |
p |
vector of probabilities. |
n |
number of observations to generate. |
rate |
vector of rates. |
log, log.p |
logical; if TRUE, probabilities p are given as log(p). |
lower.tail |
logical; if TRUE (default), probabilities are P[X <= x], otherwise, P[X > x]. |
If rate is not specified, it assumes the default value of
1.
The exponential distribution with rate λ has density
f(x) = lambda e^(- lambda x)
for x >= 0.
dexp gives the density,
pexp gives the distribution function,
qexp gives the quantile function, and
rexp generates random deviates.
exp for the exponential function,
dgamma for the gamma distribution and
dweibull for the Weibull distribution, both of which
generalize the exponential.
dexp(1) - exp(-1) #-> 0 r <- rexp(100) all(abs(1 - dexp(1, r) / (r*exp(-r))) < 1e-14)