Plotting Matrix Inequalities

[saiyajin0]

HI,

I was wondering if there is any way to plot matrix inequalities such as xA+yB >= 0 where x and y are scalars and A and B are matrices and >= 0 denotes semidefiniteness.

Also, more generally, is there a way to plot polynomial inequalities such as ax + bx^2 + c +... >= 0?

Thanks in advance.