How can i plot J(w)??

hello.

I want to plot this equation (MSE), exactly as in the image. how i can??

w is a vector, is the standard deviation of the noise, cross correlation vector between the desired signal and the noisy signal, and autocorrelation matrix.

Any values don't matter, only i want like the below graph.

[Good mind]

J(w)= σ.*σ - (2.*w'.* P)+ (w'.* R.* w)

P (cross correlation), R (autocorrelation), σ (standard deviation), w(..) coefficients