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    <p>Here's a practical example of passing arguments using the <code>...</code> object and <code>*apply</code>. It's slick, and this seemed like an easy example to explain the use. An important point to remember is when you define an argument as <code>...</code> all calls to that function must have named arguments. (so R understands what you're trying to put where). For example, I could have called <code>times &lt;- fperform(longfunction, 10, noise = 5000)</code> but leaving off <code>noise =</code> would have given me an error because it's being passed through <code>...</code> My personal style is to name all of the arguments if a <code>...</code> is used just to be safe. </p> <p>You can see that the argument <code>noise</code> is being defined in the call to <code>fperform(FUN = longfunction, ntimes = 10, noise = 5000)</code> but isn't being used for another 2 levels with the call to <code>diff &lt;- rbind(c(x, runtime(FUN, ...)))</code> and ultimately <code>fun &lt;- FUN(...)</code></p> <pre class="lang-r prettyprint-override"><code># Made this to take up time longfunction &lt;- function(noise = 2500, ...) { lapply(seq(noise), function(x) { z &lt;- noise * runif(x) }) } # Takes a function and clocks the runtime runtime &lt;- function(FUN, display = TRUE, ...) { before &lt;- Sys.time() fun &lt;- FUN(...) after &lt;- Sys.time() if (isTRUE(display)) { print(after-before) } else { after-before } } # Vectorizes runtime() to allow for multiple tests fperform &lt;- function(FUN, ntimes = 10, ...) { out &lt;- sapply(seq(ntimes), function(x) { diff &lt;- rbind(c(x, runtime(FUN, ...))) }) } times &lt;- fperform(FUN = longfunction, ntimes = 10, noise = 5000) avgtime &lt;- mean(times[2,]) print(paste("Average Time difference of ", avgtime, " secs", sep="")) </code></pre>
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