| mama {simba} | R Documentation |
The function mama uses reshape
to transpose species data given in database list format (where each line
represents a species in a plot, so the list has three columns containing
information on plot, species and information on occurence) into a plot
species matrix (where rows represent plots and columns represent species)
for further use with other functions on vegetational data.
mama(dat)
dat |
Species data in list format. The columns have to represent plot, species, occurence information (presence/absence or abundances). Column names may differ but they must be in that order! |
You could reach the same result with reshape. I was just always quite confused with this. That's why i decided to do this little wrapper for convenience. It needs quite a while to run though, but this is due to reshape.
Returns a data.frame which contains the presence/absence or abundance data of the species list. Rows represent plots, columns represent species. If you want to have it vice versa you have to use the function on a list with columns species, plots, occurrence information (in that order).
Gerald Jurasinski
data(abis)
abis.spcls <- liste(abis.spec, splist=TRUE)
## see the list, it like what you get from a database
## and return to matrix-format:
abis.test <- mama(abis.spcls)