[R] possibility to determine whether a script is "sourced"?

Jannis bt_jannis at yahoo.de
Wed Jun 23 18:06:58 CEST 2010

Dear R community,

I am running some rather large scripts either by executing single blocks of them separately or by executing them at once via 


Now there is a lot of code in those scripts that I only want to run when I run them manually, so I wonder whether there is any way to automatically find out whether the script is run manually stepwise or whether it is run via source. Is there such a possibility? 

Thanks a lot for your help!

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