There are several times in R when it is valuable to explicitly leave an argument missing. For example, when extracting a row from a matrix:
> m <- matrix(1:4, nrow=2) > m[2] # Flat indexing [1] 2 > m[2, ] # Note the comma! [1] 2 4 However, there is currently no way to support this (rather idiosyncratic) syntax in rpy2. The attached patch adds a function rpy2.rinterface.getMissingArgSexp which returns an Sexp wrapping the magic R_MissingArg object. With this patch, the following becomes possible: >>> m = r.matrix([1, 2, 3, 4], nrow=2) >>> r["["](m, 2, rpy2.rinterface.getMissingArgSexp()) Patch includes tests, which pass for me. -- Nathaniel
NEW_getMissingArgSexp
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