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<h2 class="chapter">3 Interface description</h2>
<p>In general, R functions can be accessed transparently via
attributes of the <code>r</code> object. Parameters and return values are
converted to and from R automatically. However, some R
functions, such us <code>$</code> or <code>[[</code>, need special syntax, and
sometimes objects of type <code>Robj</code> need to be manipulated.
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<li><a accesskey="3" href="R-exceptions.html#R-exceptions">R exceptions</a>
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