search for variable in package in .GlobalEnv first

Hi

First, sorry if I get the terminology wrong, I am still quite new to the
concept of using environments and workspaces.

Say I have a statement in a package SIM like

sim <- TYPE

where the variable TYPE is initialized in the package to
e.g. "exponential" (SIM::TYPE == "exponential").

Now, I want to give the user the option of specifying the variable TYPE,
but to the effect, that if the user does not define a variable TYPE in
the user workspace (.GobalEnv), the one in the namespace from the
package is used.

In other words, I want to look first in the workspace, and then in SIM::
for the variable TYPE. How can do this?

Thanks,

Rainer

Rainer M. Krug

email: RMKrug<at>gmail<dot>com
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