 class="keyword">if</span> isnumeric(x)
0050     z=zeros(numel(idx),size(topcs,2),o);
0051     <span class="keyword">for</span> k=1:o
0052         z(:,:,k)=<a href="nt_multishift.html" class="code" title="function z=nt_multishift(x,shifts)">nt_multishift</a>(x(:,:,k),shifts)*topcs;
0053     <span class="keyword">end</span>
0054 <span class="keyword">else</span>
0055     z=[];
0056     <span class="keyword">for</span> k=1:o
0057         z{k}(:,:)=<a href="nt_multishift.html" class="code" title="function z=nt