I write a package foo which requires a package bar (from CRAN) to work. So in the DESCRIPTION file I write Depends: bar. I would like it to be so that when one installs foo, then it is automatically checked whether bar is installed, and if not then bar is also installed at the same time. I remember having seen packages which do so, but I can not figure out the mechanism
'Depends: bar' in the DESCRIPTION file does not solve the problem. Can anyone help?
 
A related question: How to check programmatically that a specific package is loaded?
 
Best regards
Søren

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