On Sep 27, 2011, at 3:19 PM, Fabrice Tourre wrote:
Dear list,
How can I detect a package is installed or not? If not, then install
it.
For example, in a script, I want to check the package DESeq is
installed or not. If not, then I will using this script to install it.
source("http://www.bioconductor.org/biocLite.R";)
biocLite("DESeq")
The pseudo script would be like this:
try:
library(
Perhaps:
if ( require("DESeq") ) { do-stuff } else {
source("http://www.bioconductor.org/biocLite.R";)
biocLite("DESeq") }
'require' reports success or failure with a logical and loads the
package if successful. You need to add logical.return=TRUE to a
'library' call to get avoid getting a character value back.
catch:
source("http://www.bioconductor.org/biocLite.R";)
biocLite("DESeq")
Thank you
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______________________________________________
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and provide commented, minimal, self-contained, reproducible code.
