matrify {labdsv} | R Documentation |
Takes a data.frame in three column form (sample.id, taxon, abundance) and converts it into full matrix form, and then exports it as data.frame with the appropriate row.names and column names.
matrify(data)
data |
a data.frame or matrix in three column format (or database) format, where the first column is the sample ID, the second column is the taxon ID, and the third sample is the abundance of that taxon in that sample. |
The routine is pure R code to convert data from database form to the sparse
matrix form required by multivariate analyses in and
, as well as
dist
and other routines.
a data.frame with samples as rows, taxa as columns, and abudance values for taxa in samples.
Typically, the source of the data will be an ASCII file of a dbase
database or a CSV file from an Excel file in three column format. That file can
be read into a data.frame with read.table
or read.csv
and then
that data.frame can be matrified by this function.
David W. Roberts droberts@montana.edu
http://ecology.montana.msu.edu/labdsv/R/labdsv
x <- cbind(c('a','a','b','b','b','c','c'), c('x','y','x','z','w','y','z'), c(1,2,1,3,2,2,1)) matrify(x)