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    <p>As it currently stands, you cannot <code>dput</code> this object. The code of <code>dput</code> contains the following loop:</p> <pre><code>if (isS4(x)) { cat("new(\"", class(x), "\"\n", file = file, sep = "") for (n in slotNames(x)) { cat(" ,", n, "= ", file = file) dput(slot(x, n), file = file, control = control) } cat(")\n", file = file) invisible() } </code></pre> <p>This handles S4 objects recursively, but it relies on the assumption an S3 object will not contain an S4 object, which in your example does not hold:</p> <pre><code>&gt; isS4(slot(poly.d,'polygons')) [1] FALSE &gt; isS4(slot(poly.d,'polygons')[[1]]) [1] TRUE </code></pre> <p><strong>Edit:</strong> Here is a work-around the limitations of <code>dput</code>. It works for the example you provided, but I don't think that it will work in general (e.g. it does not handle attributes).</p> <pre><code>dput2 &lt;- function (x, file = "", control = c("keepNA", "keepInteger", "showAttributes")){ if (is.character(file)) if (nzchar(file)) { file &lt;- file(file, "wt") on.exit(close(file)) } else file &lt;- stdout() opts &lt;- .deparseOpts(control) if (isS4(x)) { cat("new(\"", class(x), "\"\n", file = file, sep = "") for (n in slotNames(x)) { cat(" ,", n, "= ", file = file) dput2(slot(x, n), file = file, control = control) } cat(")\n", file = file) invisible() } else if(length(grep('@',capture.output(str(x)))) &gt; 0){ if(is.list(x)){ cat("list(\n", file = file, sep = "") for (i in 1:length(x)) { if(!is.null(names(x))){ n &lt;- names(x)[i] if(n != ''){ cat(" ,", n, "= ", file = file) } } dput2(x[[i]], file = file, control = control) } cat(")\n", file = file) invisible() } else { stop('S4 objects are only handled if they are contained within an S4 object or a list object') } } else .Internal(dput(x, file, opts)) } </code></pre> <p>And here it is in action:</p> <pre><code>&gt; dput2(poly.d,file=(tempFile &lt;- tempfile())) &gt; poly.d2 &lt;- dget(tempFile) &gt; all.equal(poly.d,poly.d2) [1] TRUE </code></pre>
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