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In addition, we advice to install Rstudio (http://www.rstudio.com/ide/). Rstudio is a free enhanced graphical interface for R.
Function "vanwirdum"
This text (set link "functionvanwirdum.txt") needs to be copy-pasted into R. Notice that for direct usage of the vanwirdum function in R you need to have access to internet.
Using the van wirdum function without internet is possible but you need to download this file and replace the following (set link to "Adaption of functionvanwirdum.txt").
If you are in need of help you can access these helpfiles (set link to "helpfile.txt").
Example
For an easy example you can use the RHdata (set link to "RHdata.csv") or another dataset containing the date of measurement, EC (measured at 25 degrees Celsius) and IR (ionic ratio in %).
For some nice ideas about the use of this function we rever to the examples file.
Expert use
For more experienced R users and for further options for the use of the function we refer to this zipfile (set link to "Advanced examples.zip") the advanced file. Next to advanced examples it also includes the set up of the VanWirdum function and helpfiles prepared for use in R as a package.