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how to plot this 2D function

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Lewis Fer
Lewis Fer on 16 Jun 2021
Commented: Lewis Fer on 16 Jun 2021
I'm trying to solve this 2D problem in matlab,
for a given matrices (2*2 dimension for example)
sigma=the maximum singular value of matrix K;
the fist axix is p and the secon axix is s where 1<p<4 and 1<s<4 and
K=[p-1 -2; -3 s-4]
how to 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 ),
  2 Comments
Lewis Fer
Lewis Fer on 16 Jun 2021
and how to compute thes igma=the maximum singular value of matrix K with the plot ?

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