Message-ID: <20718.36238.52384.86543@stat.math.ethz.ch>
Date: 2013-01-10T09:44:46Z
From: Martin Maechler
Subject: "Default" accessor in S4 classes
In-Reply-To: <7BE26BCC-F7A3-428B-9833-E6EFEA83BCF0@warwick.ac.uk>
>>>>> Chris Jewell <chris.jewell at warwick.ac.uk>
>>>>> on Wed, 9 Jan 2013 13:28:49 +1300 writes:
>>>>> "CJ" == Chris Jewell <chris.jewell at warwick.ac.uk>
>>>>> on Wed, 9 Jan 2013 13:28:49 +1300 writes:
CJ> Okay, thanks for the input, All. I'd settled on the explicit coercion as.data.frame as well as the myObject[] syntax which makes a lot of sense. I'd also like to implement an as.double() method. However, I'm having trouble embedding this into my package. In the R file I have:
CJ> setMethod("as.double", "HD5Proxy", function(x) as.double(x[]))
CJ> and exportMethods(as.double) in my NAMESPACES file. However, on checking the package, I get an error saying that method "as.double" cannot be found. I noticed that the setMethod command actually returns a character vector with "as.numeric", so I'm assuming this is the problem. How do I explicitly export my as.double method?
As you've noticed above, `` R prefers as.numeric ''
and that is what you should be dealing with instead :
It's unsatisfactory I agree, but that's what it currently is:
setMethod("as.numeric", ....
and exportMethods(as.numeric)
Martin