[R] checking if a package is installed

[pdb]

Hi,

I am writing a function that requires a specific package to be installed.

Is there a way of checking if the package is installed and returning a TRUE
/ FALSE result so my function can return an appropriate error message and
exit the function gracefully rather than just bombing out? 

I'm thinking along the following lines (but want code that works),

f_checkpackage <- function()
{

if (library(madeupname) == TRUE) {
    cat("package loaded OK\n")
}
else
{
     cat("ERROR: package not loaded")
}
 
}

f_checkpackage()
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