V2Pdim: Trophic level volume to pyramid dimensions

In marchtaylor/EwEvis: Ecopath with Ecosim visualization

Description

Used internally by Vpyramid3d. The angle (i.e. steepness) of the pyramid is determined by the mean transfer efficiency (TEgm). The top angle is proportional to the inverse of the TEgm value.

Usage

V2Pdim(V, TEgm)

Arguments

V	vector of volumes (i.e. throughput) from lowest to highest trophic level (TL)
TEgm	geometric mean transfer efficiency (TLs 2-4)

Value

A list containing (from lowest to highest TL): base widths (a), heights (h), cumulative height (cum.h), a:h ratio (ah_ratio), top angle(angle), volumes (V), geometric mean transfer efficiency (TEgm), cumulative volume (cum.V).

Examples

# From Tam et al (2008) - Northern Humboldt Current Ecosystem (1995-1996)
TEgm <- 0.1014
Ts <- c(27165, 22349, 1658, 266.3, 17.45, 0.607, 0.00515, 6e-06)
V2Pdim(V = Ts, TEgm = TEgm)

marchtaylor/EwEvis documentation built on Dec. 2, 2019, 4:44 p.m.