H infty norm with Finite frequency control 2D

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Lewis Fer
Lewis Fer on 17 Jun 2021
Edited: Lewis Fer on 18 Jun 2021
I'm trying to solve this 2D problem in matlab,
for a given matrices (2*2 dimension for example) using the following notations :
A frequency-domain representation of the matrix K
sigma=the maximum singular value of matrix K;
the fist axis is p and the secon axis is s where 1<p<4 and 1<s<4 and
K=[p-1 -2; -3 s-4]
how to ( compute and plot ) the surf that represnt for each pair (p,s) the ( sigma=the maximum singular value of matrix K) like this graph ( note that this graph is for a nother example ),

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