[R] Problem with save/load across R versions and OS

[Sebastien Bihorel]

Hi, 

I am trying to transfer an S4 object from a machine working with CentOS 7.2 / R 3.4.3 to another one running Linux Mint 19 / R 3.6.0. If I save the object using saveRDS in obj.rds, loadRDS returns an "unknown input format" error on my Linux Mint machine. Interestingly enough, obj.rds loads just fine in a 3rd machine running Windows Server 2012 / R 3.4.3. I tried also using save and load and various values of the ascii and compression arguments, but still no cigar... 

Do you have recommendations on how to successfully transfer my object to my Linux Mint machine? 

Thanks 

Sebastien