in my work,-log(x) is convex optimization,i use matlab’s cvx.

for example,minimize(norm(-log(x)));

x is matrix

but matlab said,error( ‘Disciplined convex programming error:\n Cannot perform the operation norm( {%s}, %g

)\n when the first argument is a matrix.’, cvx_class( xt ), p );

i don’t know why it can’t work,I ask for help