How can I type inverse sign in axis labels?

I'd like to type something like in the picture in the x label text. Can someone tell me how to do that?

Answer 1

[Star Strider]

Try this:

figure
plot(rand(1,20), rand(1,20), 'p')
xlabel('A^{-1}')                                            % Using Default ‘TeX’ Interpreter
xlabel('$A^{^-1}$', 'Interpreter','latex')                  % Using ‘LaTeX’ Interpreter