m denominador <em>n</em>.
</p>
<p>Exemplo:
</p>
<pre class="example">(%i1) load (descriptive)$
(%i2) load (numericalio)$
(%i3) s1 : read_list (file_search (&quot;pidigits.data&quot;))$
(%i4) std (s1), numer;
(%o4)                   2.902740084816414
(%i5) s2 : read_matrix (file_search (&quot;wind.data&quot;))$
(%i6) std (s2);
(%o6) [4.149928523480858, 3.871399812729241, 3.933920277534866, 
                            5.672434260526957, 4.941970881136392]
</pre>
<p>Veja tamb&eacute;m as fun&ccedil;&otilde;es