How to display plant species biomass in a site by species matrix?
I earlier asked "How to display two columns as binary (presence/absence) matrix?". This question received two excellent answers. I would now like to take this a step further and add a third column to the original site by species columns which reflects the biomass of each species in each plot. Column 1 (plot) specifies code for ~ 200 plots, column 2 (species) specifies code for ~ 1200 species and Column 3 (biomass) specifies the dryweight. Each plot has > 1 species and each species can occur in > 1 plot. The total number of rows is ~ 2700. > head(dissim) plot species biomass 1 a1f56r jactom 20