omment">%% INVSHIFTED - Tikhonov-Phillips regularisation with shifted CG</span>
0004 <span class="comment">%% [X,rho,eta,iter] = invshifted(A,b,alpha)</span>
0005 
0006 <span class="keyword">if</span> nargin&lt;2, error(<span class="string">'Too few input arguments!!'</span>); <span class="keyword">end</span>
0007 <span class="keyword">if</span> nargin&lt;3, alpha=0.15; <span class="keyword">end</span>
0008 <span class="keyword">if</span> ~(alpha(1)&gt;0), alpha=0.15; <span class="keyword">end</span>
0009 
