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copied!<p>Are you sure the <em>R</em> versions are compatible here? The internal parts of <code>ecdf()</code> and <code>approxfun()</code> objects {yes, they <em>are</em> functions} have been changed relatively recently and now go via the <code>.approxfun(..)</code> wrapper which is a hidden in the "stats" namespace.</p> <p>But I really assume the problem comes because you use data(.) in order to use such objects in your package, and on R package building, R may resave the data and ends up losing the important property that <code>environment(fc)</code> must have <code>"stats"</code> as a parent environment. </p> <pre><code>> set.seed(7); Fn <- ecdf(rnorm(12)) > save(Fn, file="/tmp/Fn.rda") > rm(Fn) > load(file="/tmp/Fn.rda") > Fn Empirical CDF Call: ecdf(rnorm(12)) x[1:12] = -1.1968, -0.97067, -0.94728, ..., 2.2872, 2.7168 > plot(Fn) > Fn(1) [1] 0.75 > q() ... restart R > (load(file="/tmp/Fn.rda")) [1] "Fn" > Fn(1) [1] 0.75 > parent.env(environment(Fn)) <environment: namespace:stats> </code></pre> <p>So everything works with regular save()ing and load()ing of ecdf objects.</p> <p>Solution proposal: Don't use <code>data()</code> for storing objects that are used inside your functions. <code>data()</code> is not at all thought for this (but rather for providing illuminating data sets).</p> <p>Rather put it into something like /inst/internal/ecdf_lst.rda and get it into your function by something like <code>load(system.file("internal/ecdf_lst.rda", package="<pkg>"))</code></p>

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