I tried in "Parallel"-->"Manage Cluster Profiles"-->"Edit", and then I put 16 in the box of "number of workers to start on your local machine".
As I execute
matlabpool open 16;
It fails in warning "NumWorkers must be an integer from 1 to 12." So is there any way to increase the limit? Or what is the cost to buy a license to implement this?