Your function is the inverse of Express 1/(a^2+x^2) in cvx and therefore (probably) cannot be done. It is the same issue: if the function is convex only on a semi-artificial part of its natural domain then it is hard to express in conic form.
Your function is the inverse of Express 1/(a^2+x^2) in cvx and therefore (probably) cannot be done. It is the same issue: if the function is convex only on a semi-artificial part of its natural domain then it is hard to express in conic form.