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How can I delete all rows and columns of all zeroes in a symbolic matrix?
The solution listed here ( http://www.mathworks.com/matlabcentral/answers/40018-delete-zeros-rows-and-columns ) does not work when the matrix is symbolic. The any command produces an error "Unable to prove variable-name literally."
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syms x1 data = [ x1, 1, 0 ; 0, 0, 0 ; 0, 1, 0] data( all( isAlways(data==0) ,2) ,:) =  data( : ,all( isAlways(data==0) ,1)) =