bin_midpoints: Geometric bin centres of the size grid
In mizer: Dynamic Multi-Species Size Spectrum Modelling

bin_midpoints

R Documentation

Geometric bin centres of the size grid

Description

Internal helper for the second-order plotting code. A finite-volume cell average N_j = (1/\Delta w_j)\int_{w_j}^{w_{j+1}} N\,dw does not live at the left bin edge w_j but at the geometric bin centre

w^*_j = \sqrt{w_j\,w_{j+1}} = w_j\sqrt{\beta},

where \beta = w_{j+1}/w_j is the (constant) bin ratio of the logarithmic grid. This is the log-symmetric, second-order-correct location at which to plot a bin-averaged quantity (it is exact for the community spectrum N\propto w^{-2}). It is a uniform half-bin shift to the right on the log axis, the same for the consumer grid w and the full prey/resource grid w_full.

Usage

bin_midpoints(params, w_full = FALSE)

Arguments

`params`	A MizerParams object.
`w_full`	If `TRUE`, return the centres of the full (resource) grid `params@w_full`; otherwise the consumer grid `params@w`.