I want to maximize log(x^t*A*x)-b^t*x , this is a concave problem. Why cvx refused and shown: " Invalid operation: log( {positive convex} )"
Please read the FAQ Why isn't CVX accepting my model? READ THIS FIRST!.
help cvx/log
Disciplined convex programming information: log(X) is concave and nondecreasing in X. When used in CVX expressions, X must be concave.
Thank you for your reply, I know where my problem is.