MATLAB: How to delete particular values in this matrix

matrixmatrix arraymatrix manipulation

 [a b]=[     0.5708    0.0755         0         0         0         0         0
                  0         0  161.5569         0   84.9907   35.0193   17.0669];
i don't want the values before this
" 0
  0 "
and my answer should be like this..
 [c d]=[ 0         0         0         0
         0   84.9907   35.0193   17.0669];

Best Answer

To solve your (constantly changing) requirement stated in your last comment to my original answer, try this code:
allR111 = [allR11;allR21];
Y3 = true(1,size(allR111,2));
Y3(1:find(abs(allR111(1,:))<1e-6,1,'last')) = false;
Y3(1:find(abs(allR111(2,:))<1e-6,1,'last')) = false;
allR111(:,Y3)
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