Calculate Demetrius' entropy from trajectories of age-specific survivorship and fecundity
This function calculates Demetrius' entropy from vectors of age-specific survivorship (lx) and fecundity (mx).
entropy_d(lx, mx)
lx |
Age-specific survivorship trajectory (a vector of monotonically-declining values in the interval [0,1]). |
mx |
Age-specific fecundity trajectory (a vector of non-negative values). |
#' @section Warning:
Note that this function may produce unexpected results if used on partial
survivorship and fecundity trajectories. In addition, it is sensitive to the
length of the these vectors. We direct users to the functions
'shape_surv' and 'shape_rep' which are relatively
robust to these issues.
Demetrius' entropy.
Roberto Salguero-Gomez <rob.salguero@zoo.ox.ac.uk>
Patrick Barks <patrick.barks@gmail.com>
Demetrius, L., & Gundlach, V. M. 2014. Directionality theory and the entropic principle of natural selection. Entropy 16: 5428-5522.
Other life history traits:
entropy_k(),
gen_time(),
life_expect_mean(),
longevity(),
net_repro_rate(),
repro_maturity,
shape_rep(),
shape_surv()
data(mpm1) # derive trajectories of lx and mx, starting from stage 2 lx <- mpm_to_lx(mpm1$matU, start = 2) mx <- mpm_to_mx(mpm1$matU, mpm1$matF, start = 2) # calculate Demetrius' entropy entropy_d(lx, mx)
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