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2 How can I use KWin to obtain a grayscale effect in Kubuntu 18.04? kubuntu kwin share | improve this question asked Sep 17 '18 at 13:41 DK Bose DK Bose 13.5k 12 40 83 add a comment  |  2 How can I use KWin to obtain a grayscale effect in Kubuntu 18.04

-1 $begingroup$ begin{array}{ll} text{maximize} & frac{X_{11}det(T)}{T_2^2+T_4^2}\ text{subject to} & {TXT^T}_{ii}leq P_iend{array} where $Tinmathbb{R^{2times2}}$ , $T=begin{bmatrix}T_1 & T_2\T_3 &T_4end{bmatrix}$ , $T$ is invertible, $Xinmathbb{R^{2times2}}$ , $X=begin{bmatrix}X_{11} & X_{12}\X_{12} &X_{22}end{bmatrix}>0$ (positive definite). We need to maximize in terms of $P_1$ and $P_2$ , which are given. I have no idea how to tackle this question, even when $T$ is unitary, we just need to maximize $X_{11}$ , it turns out not straightforward. matrices optimization share | cite | improve this question edited Jan 3 at 7: