[R] Selective package installation

[Prof Brian Ripley]

On 18/05/2015 08:14, Partha Sinha wrote:
> I am using Win 7, 32 bit and R 3.2.0
>
> I want to install few packages via script.
> The script should first check if the package is already installed (I
> dont want update).If the package is already there , then it would go
> to the next package in my list.
> How can I do this ?

Take a look at the code of the built-in function new.packages(): what 
you ask for is a variant on what it does.


-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Emeritus Professor of Applied Statistics, University of Oxford
1 South Parks Road, Oxford OX1 3TG, UK