excellent thank you, that worked perfectly. I just need to remember this feature next time I need it.<br>Thanks again<br><br><div class="gmail_quote">On Thu, Apr 12, 2012 at 11:41 PM, Tim Cera <span dir="ltr">&lt;<a href="mailto:tim@cerazone.net">tim@cerazone.net</a>&gt;</span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Use &#39;ma.max&#39; instead of &#39;np.max&#39;.  This might be a bug OR an undocumented feature.  :-)<div><br></div><div>
<font face="&#39;courier new&#39;, monospace">    import <a href="http://numpy.ma" target="_blank">numpy.ma</a> as ma</font></div>
<div><font face="&#39;courier new&#39;, monospace">    marr = ma.array(range(10), mask=[0,0,0,0,0,1,1,1,1,1])</font></div><div><font face="&#39;courier new&#39;, monospace">    np.max(marr)</font></div><div><font face="&#39;courier new&#39;, monospace">    4                      # mask is used</font></div>

<div><font face="&#39;courier new&#39;, monospace"><br></font></div><div><font face="&#39;courier new&#39;, monospace">    a = []</font></div><div><font face="&#39;courier new&#39;, monospace">    a.append(marr)</font></div>

<div><font face="&#39;courier new&#39;, monospace">    a.append(marr)</font></div><div><font face="&#39;courier new&#39;, monospace">    np.max(a)</font></div><div><font face="&#39;courier new&#39;, monospace">    9                      # mask is not used</font></div>

<div><font face="&#39;courier new&#39;, monospace"><br></font></div><div><font face="&#39;courier new&#39;, monospace">    ma.max(a)</font></div><div><font face="&#39;courier new&#39;, monospace">    4                      # mask is used</font></div>

<div><br></div><div>Kindest regards,</div><div>Tim</div>
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<br></blockquote></div><br>