I would like to use the "create.matrix" function (R package "fossil") to create a matrix of taxa, localities, time and abundance.
In the function, time is specified by the arguments "time.col" (= column name or number containing the time periods) and "time" (= which time periods to keep for the matrix). In my data table, time is specified as a calendar date (d.m.y: e.g. 31.12.2022).
How should time ("time periods") be specified or formatted in the data table to be used by the create.matrix function?
How should time periods be specified in the "time" argument?
I want to create a species by (locality by date) matrix (a part of the data is attached). Some localities were sampled only once, some several times. As "time period" in the argument "time" I want to use the date of sampling (column "date" in the dataset), but I do not know how to specify it in the code below ("????"):
Function:
df
The create.matrix function in the fossil package helps build matrices for analyzing fossil data. It organizes information about taxa (types of organisms), locations (where fossils were found), and abundance (how many fossils were found).
To include time information in the matrix, use the time argument. This argument accepts either a vector or a matrix of time values.
- Vector for time: If your time data is in a simple format like years, provide a vector of those years. For example:
R
library(fossil) time
Henry EZE Chukwu Thanks for the answer.
But how to specify the 'time' argument in 'create.matrix' function?
"time" = which time periods to keep for the matrix. I want to keep each date for the matrix.
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