mx_dropzero: Drop zero-sum rows or columns

In phytomosaic/ecole: ecole: School of Ecology Package

Description

Drop zero-sum rows or columns from a species abundance matrix, often needed before calculating dissimilarities.

Usage

mx_dropzero(x, method = "col", silent = TRUE, ...)

Arguments

x	array of species data, where rows = SUs and cols = species
method	either one of 'col' or 'row'
silent	logical, do not report number of rows or columns dropped?
...	further arguments passed to other methods

Details

Often useful before calculating certain dissimilarity measures.

Value

Modified dataframe or matrix, with fewer rows or columns than the original.

Examples

# species abundance data
set.seed(1917)
spe <- data.frame(matrix(rnorm(30, 10, 50), 10, 3))
spe[spe < 0] <- 0
colnames(spe) <- c('Acer rubrum','Acer saccharum','Acer negundo')
spe
mx_dropzero(spe) # returns unchanged abundance matrix or data.frame
spe[,2] <- 0
spe[4,] <- 0
mx_dropzero(spe, 'col') # second column removed
mx_dropzero(spe, 'row') # fourth row removed

phytomosaic/ecole documentation built on Jan. 2, 2022, 11:24 p.m.