I wonder, can I do any harm to my system (or the stability of R installation) if I install some package twice. Or when installing a new package it will simply overwrite the previous version.
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1It shouldn't be an issue unless you install a package as an admin user, and again as a normal user. Then you will have a version in two different locations on your system. That could lead to issues when upgrading, or confusion as to which version is loaded. – neilfws Feb 18 '19 at 10:37
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Why would you need to do this? Check if the [package is already installed before installing it](https://stackoverflow.com/q/4090169/680068)? – zx8754 Feb 18 '19 at 12:37
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@xx8754, sometimes it happens by accident and just trying to accident what is the best way to proceed once something like this happens. – Vitalijs Feb 19 '19 at 13:25
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Happens to me all the time that I execute install.packages on something that I have installed before. You just get a warning.
Nathalie
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I am still not fully getting it, are saying there is not harm in doing it? – Vitalijs Feb 18 '19 at 10:25