);">surf</span>([a b c d]</pre>
If the X axis (rank 2) has not been defined, the index of the objects
in the array is used. The surf method<span style="font-style: italic;">
'surf' </span>and<span style="font-style: italic;"> 'scatter3'</span>
methods are here
equivalen<span style="font-style: italic;">t (colored lines)</span>,
whereas <span style="font-style: italic;">'plot3' </span>and <span style="font-style: italic;">'waterfall'</span> draw simple
lines.<br>
<br>
An other way to achieve a similar result