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<p><a name="doc_002ddiff"></a>
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— Function File: <b>diff</b> (<var>x, k, dim</var>)<var><a name="index-diff-913"></a></var><br>
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— Function File: <b>diff</b> (<var>x, k, dim</var>)<var><a name="index-diff-912"></a></var><br>
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<blockquote><p>If <var>x</var> is a vector of length <var>n</var>, <code>diff (</code><var>x</var><code>)</code> is the
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vector of first differences
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<var>x</var>(2) - <var>x</var>(1), <small class="dots">...</small>, <var>x</var>(n) - <var>x</var>(n-1).