Hi,
this happen when two or more packages have functions with the same names. 
Using search() you can see which package are loaded in your working
environment. Thus, using the name of the function will call the function of
the first package you see in the search output.
To use a specific function you need to specify both the package containing
the function and then the function 
E.G.
pckg:function(parameters)

hope this helps

-----
Giuseppe Calamita
PhD at CNR-IMAA Italian National Council of Research - Institute of 
Methodologies for Environmental Analysis,  Tito Scalo -Potenza ITALY
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